Zeolite Glossary: The most important terms related to zeolite & soil care, simply explained

Anyone dealing with zeolite quickly encounters terms like cation exchange capacity, adsorption, or tribomechanical activation – and wonders: What does that actually mean? This glossary explains the most important technical terms related to zeolite, soil science, and minerals in a way that is—hopefully—truly understandable. No academic German, no unnecessary complexity – just clear explanations to help you better understand and use zeolite more effectively.

A

Absorption 
Absorption describes the complete intake of a substance into a material—the substance effectively disappears inside and is bound there. A classic example is a sponge that absorbs water: the water is inside but no longer freely available on the surface. In soil, one speaks of absorption, for instance, regarding the intake of water into clay particles. The crucial difference from adsorption: what is absorbed cannot be easily released in a controlled manner.

Adsorption
Adsorption, by contrast, describes the accumulation of substances on a surface—not inside a material, but on its outer or pore walls. The adsorbed substances remain stuck to the surface but can be detached and released as needed under changed conditions. This is exactly what makes adsorption so valuable: it is reversible and controllable.

Zeolite works exclusively through adsorption: water, nutrients, and pollutants accumulate on the enormous internal surface of the zeolite pores—and are released again when needed. One gram of zeolite can have an internal surface area of several square meters. This is why zeolite is so effective as a nutrient buffer, water reservoir, and natural filter—and differs fundamentally from a simple sponge, which absorbs instead of adsorbs.

Activation (tribomechanical ~) In the tribomechanical activation process, zeolite is altered on a molecular level through mechanical friction. This creates new, reactive surfaces—the mineral's adsorption capacity increases significantly. Activated zeolite works faster and more intensely than untreated material. BODENKRAFT PUR uses tribomechanically activated zeolite to achieve maximum effect in the soil.

Aluminosilicate
Chemically, zeolite belongs to the group of aluminosilicates. This means its crystal framework consists essentially of silicon, aluminum, and oxygen. These building blocks are connected in a highly ordered spatial structure, forming a stable mineral framework with many fine cavities and channels. It is this specific construction that makes zeolite so interesting.

The aluminum in the framework ensures that the structure does not remain electrically neutral. As a result, certain positively charged particles, i.e., cations like sodium, potassium, calcium, or ammonium, can be bound and exchanged within the zeolite. This ability is one of the most important foundations for the special effect of zeolite in soil, barns, water, or technical applications. Simply put: zeolite is not just any rock powder, but a finely structured natural aluminosilicate with an astonishingly active internal order.

Ammonium (NH₄⁺)
Ammonium is a nitrogen-containing compound that is considered an important nutrient source for plants in the soil. Zeolite has a particularly high affinity for ammonium—it binds it to its negatively charged structures and releases it in a controlled manner. This prevents nitrogen from being washed out during heavy rain or intense watering, making the plant's nutrient supply more uniform and efficient.

B

Basalt Flour
Basalt flour is created by finely grinding basalt rock—a volcanic igneous rock rich in trace elements such as iron, manganese, zinc, and magnesium. Used in the garden, it improves soil structure, provides plants with minerals, and promotes soil life. Basalt flour acts slowly and sustainably—it is not a quick-acting fertilizer but a long-term mineral base supply for the soil.

Soil Additive
A soil additive is a product that does not primarily provide nutrients but improves the properties of the soil itself—such as structure, water retention, aeration, or soil life. Zeolite is a classic soil additive: it provides no direct nutrients to the soil but improves its ability to hold nutrients, store water, and provide habitat for microorganisms. Leonardite, basalt flour, and compost also count as soil additives depending on their use. The term is legally relevant—in the EU, soil additives are subject to different approval regulations than fertilizers.

Fertilizer
A fertilizer provides plants with directly usable nutrients—nitrogen, phosphorus, potassium, and others. It is intended to promote plant growth through nutrient supply. Fertilizers often work quickly and specifically, but in case of over-fertilization, they can damage soil life, wash nutrients into groundwater, and degrade soil structure in the long term. Zeolite is explicitly not a fertilizer—it does not provide nutrients but improves the availability of existing nutrients. This difference is important: zeolite does not replace fertilizer but makes it more efficient.

Soil Tilth
Soil tilth (or "Bodengare") describes the ideal condition of a soil: loose, crumbly, well-aerated, rich in humus, and teeming with microorganisms. Healthy soil is easy to work, retains water optimally, and offers plants ideal growing conditions. Zeolite, compost, and active microorganisms work together to improve and maintain soil tilth over the long term.

Soil Life
Soil life refers to the entirety of all living organisms in the soil—bacteria, fungi, earthworms, mites, springtails, and many more. Active soil life is the foundation for a fertile garden: it breaks down organic matter, makes nutrients available, improves soil structure, and protects plants from diseases. Zeolite supports soil life by providing habitat in its pores and creating favorable moisture conditions.

Soil Structure
Soil structure describes how mineral particles, organic matter, water, and air are arranged in the soil. A good structure means stable aggregates (crumbs), sufficient air pores, and uniform water distribution. Poor soil structure—for instance, due to compaction or humus loss—leads to waterlogging, drought stress, and poor root growth. Zeolite improves soil structure by creating stable micro-spaces between soil particles.

C

Clinoptilolite
Clinoptilolite is the most common and best-researched natural zeolite type. It belongs to the group of heulandite zeolites and is characterized by a particularly stable crystal structure and high cation exchange capacity. Clinoptilolite is the active ingredient behind most zeolite products for gardening, agriculture, and cosmetics. 

D

Drainage
Drainage describes a soil's ability to divert excess water and prevent waterlogging. Good drainage is important for root respiration—roots need oxygen and cannot endure permanently water-saturated conditions. Zeolite granulate improves drainage by creating cavities in the soil through which water can run off without completely hindering water retention.

G

Rock Flours
Rock flours are finely ground natural rocks, for example, basalt, diabase, granite, or zeolite. They naturally contain many minerals and trace elements.

In gardening and agriculture, rock flours are valued because they can gently enrich soils with minerals. They do not act quickly like a fertilizer, but rather slowly, in a balancing and sustainable way. Depending on the type of rock, they can improve soil structure, support soil life, and upgrade compost.

Not every rock flour is the same. The starting rock, fineness, purity, and origin are decisive. Zeolite rock flour plays a special role among rock flours because, due to its porous structure, it can additionally bind water, nutrients, and certain substances.

In short: rock flours are natural mineral carriers from finely ground rock that can support soils and natural cycles over the long term.

Granulate 
Granulate refers to zeolite in a coarse, granular form—as opposed to fine powder. The granulate is particularly suitable for improving soil structure and aeration, as a drainage layer in pots and raised beds, and as a long-term water reservoir in deeper soil layers. BODENKRAFT PUR is available in both forms: as a fine powder for uniform distribution in the substrate and as a granulate for structure and aeration.

H

Hecht, Prof. Dr. Karl
Prof. Dr. med. habil. Karl Hecht was a German physiologist, sleep and stress researcher, and professor at the Charité in Berlin. Born in 1924, he shaped research on chronobiology, neurophysiology, and environmental medicine for many decades. In his later years, he intensively studied natural minerals like clinoptilolite zeolite and contributed significantly to zeolite being perceived in German-speaking countries not only as a technical mineral but also as a biologically and ecologically interesting natural material. He published numerous scientific papers and several books, including a widely noted work on zeolite.

For many people, Karl Hecht is so significant because he tried to build bridges: between classical science, naturopathy, prevention, and a deeper understanding of natural regulatory processes. He did not describe zeolite as a miracle cure, but as a special mineral whose properties should be seriously researched and carefully classified. His name therefore still appears repeatedly when it comes to clinoptilolite, soil detoxification, regulation, and natural approaches in agriculture. In the zeolite world, he is considered by many to be one of the most important pioneers of a well-founded, science-oriented discussion of this mineral.

Humic Acids
Humic acids are complex organic compounds that form during the decomposition of organic matter. They are a main component of humus and play a central role in soil life: they improve soil structure, promote water-holding capacity, make nutrients more accessible to plants, and support root growth. Leonardite is a particularly humic acid-rich natural substance and is therefore used as a soil improver.

Humus
Humus is the organic matter in the soil that arises from the decomposition of plant and animal materials. It is the heart of fertile soil: it stores water and nutrients, promotes soil life, improves structure, and makes the soil more resistant to heat and drought. The buildup of humus is a slow process—zeolite and leonardite can meaningfully support and accelerate it.

I

Ion Exchange
Ion exchange is the central mechanism of action of zeolite. The mineral's crystal structure carries a negative charge and attracts positively charged ions (cations) such as potassium, calcium, magnesium, or ammonium. These ions are stored and can be released later—when the plant needs them. This controlled exchange makes zeolite a natural nutrient buffer in the soil.

K

Cation Exchange Capacity (CEC)
The cation exchange capacity is a measure of how many positively charged nutrient ions (cations) a soil or mineral can store. The higher the CEC, the more nutrients can be bound and kept available for plants. Zeolite has an exceptionally high CEC – significantly higher than most natural soils. This is one of the main reasons why zeolite is so effective as a soil additive.

Clinoptilolite → See Clinoptilolite (alternative spelling of the same type of zeolite)

Grain size
The grain size describes the particle size of a material – from fine powder to coarse granules. For zeolite, the grain size has a direct influence on its effectiveness: fine powder has a larger surface area and acts faster; coarse granules improve soil structure and have a longer-lasting effect. Fine powder is particularly suitable for potting soil, while granules are the better choice for raised beds or garden soil – or a combination of both.

Crystal structure
The crystal structure describes the internal configuration of a mineral. In zeolite, this structure is particularly fascinating because its framework consists of regularly arranged building blocks that together form a system of fine channels, cavities, and cage structures. This internal order is no coincidence, but the foundation for almost everything that distinguishes zeolite.

In clinoptilolite, one of the most important natural forms of zeolite, the crystal contains several intersecting channels of precisely defined sizes. This allows water, ions, and small molecules to be absorbed, stored, and released again. The crystal structure therefore explains why zeolite can store water, exchange cations, and selectively bind certain substances. In short: the special effect of zeolite does not begin on the outside, but deep within its finely ordered internal architecture.

L

Lelas, Tihomir
Tihomir Lelas is considered a formative figure in connection with the tribomechanical grinding and activation of minerals. He developed processes in which natural minerals such as zeolite or limestone are not only ground very finely, but their surface properties are simultaneously altered. His goal was to increase the natural reactivity of these substances so that they can fulfill certain binding, exchange, and surface processes even more effectively. Through his developments and patents, his name became particularly well known in the field of tribomechanically activated minerals.

Tihomir Lelas is often mentioned in connection with zeolite because his work shaped the idea that not only the chemical composition of a mineral is important, but also its physical processing. A zeolite is therefore not simply "ground" or "unground" — the way it is crushed and activated can also have an influence on surface area, particle size, and reaction behavior. This is why the name Lelas is frequently encountered when discussing tribomechanical activation, micronization, and particularly reactive forms of zeolite.

Leonardite
Leonardite is a naturally occurring weathering product of lignite that is extremely rich in humic acids. It is used as a soil conditioner to increase humus content, improve nutrient availability, and promote soil life. Leonardite works particularly well on leached, low-humus soils – and ideally complements zeolite: while zeolite acts as a rapid buffer, leonardite builds up the humus structure over the long term.

M

Micron
A micron (µm) is one millionth of a meter – the diameter of a human hair is about 50–100 µm. The smaller the micron value of the zeolite powder, the finer the material and the larger the surface area where adsorption and absorption can take place. Therefore, it is more effective and impactful.

Microorganisms
Microorganisms are microscopic living organisms – bacteria, fungi, yeasts, and others – that play a crucial role in the soil. They decompose organic matter, make nutrients available to plants, form symbioses with roots, and protect plants from pathogens. A healthy soil microbiome is the foundation for a productive garden. The product AM+PLUS contains active microorganisms that specifically build up and strengthen soil life.

Micronization
Micronization refers to the extremely fine grinding of a material to the micrometer level. Micronized zeolite has an enormously increased surface area and thus a significantly higher reactivity. The powder distributes more evenly in the soil or substrate and unfolds its adsorptive effect more quickly. Micronized zeolite powder is particularly suitable for certain applications – for example, in potting soil or as a feed additive.

Mycorrhiza
Mycorrhiza refers to a symbiosis between fungi and plant roots. The fungus provides the plant with water and nutrients from the soil that it could not reach on its own – the plant, in turn, provides the fungus with sugar. This symbiosis is widespread in healthy soils and is enormously important for plant growth. With its porous structure, zeolite creates ideal living conditions for mycorrhizal fungi in the soil.

P

Paramagnetism
Paramagnetism describes the weak magnetic attraction of certain materials in an external magnetic field. In the context of soils and minerals – including certain types of zeolite and basalt rocks – paramagnetic properties are attributed a positive effect on plant growth. Research into this is still ongoing, but in organic farming, paramagnetism is increasingly discussed as a quality feature for soil minerals.

pH value
The pH value indicates the acidity or alkalinity of the soil – on a scale from 0 (extremely acidic) to 14 (extremely alkaline). Most garden plants thrive best at a pH value between 6.0 and 7.0. Soil that is too acidic blocks nutrients, as does soil that is too alkaline. Zeolite acts as a natural pH buffer: it stabilizes the pH value and buffers fluctuations. For strongly acidic soil, a combination of zeolite and GRÜNKRAFT CALCIUM is recommended.

Porosity
Porosity describes the proportion of voids (pores) in a material or soil. High porosity means plenty of space for water, air, and microorganisms. Zeolite is one of the most porous naturally occurring minerals of all – its internal surface area can amount to many square meters per gram of material. This extraordinary porosity is the reason for its high adsorption capacity and water storage capacity.

Powder
Zeolite in powder form has a very fine grain size and therefore a very large surface area in relation to its volume. It distributes evenly throughout the soil or substrate, works quickly, and comes into direct contact with fine roots and soil particles. BODENKRAFT PUR powder is ideal for potting soil, as an additive to compost, or for surface incorporation into existing beds.

S

Selectivity
Selectivity means that zeolite does not bind everything indiscriminately, but prefers to absorb certain substances over others. You can think of it as a natural preference: depending on the structure, charge, and size, some ions or molecules fit better into the interior of the zeolite than others. It is precisely this targeted selection that makes zeolite so special.

The selectivity depends primarily on the crystal structure, the pore size, the silicon-aluminum ratio, and the cations already present in the mineral. This is why a zeolite can, for example, be particularly receptive to certain ions, while others are bound only slightly. This is important in practice because it means that zeolite does not simply "soak up anything," but reacts in a very targeted way in many applications — such as with ammonium, odors, or certain pollutants.

Silicate
Silicates are minerals based on silicon dioxide (SiO₂) – and zeolite belongs to the large family of silicates. Silicates are the most common minerals in the earth's crust and form the basis of most rocks. The special crystal structure of zeolite silicates – with their regular cavities and channels – is the key to all its useful properties as an adsorbent and ion exchanger.

Silicon (Si)
Silicon is the second most common element in the earth's crust and an important trace element for plants and animals – although it was long considered non-essential. For plants, silicon strengthens cell walls, making them more resistant to fungal diseases, pests, drought stress, and heavy metal contamination. Plants well-supplied with silicon stand more upright, have more stable tissue, and are overall more robust.

In soil, silicon is found almost exclusively in bound form – as a silicate mineral, which includes zeolite. Whether and how much of this is bioavailable to plants depends heavily on the pH value and soil activity. Active microorganisms can help make bound silicon accessible to plants.

For animals – especially for horses, dogs, and livestock – silicon also plays a role: it supports the formation of connective tissue, bones, fur, hooves, and claws. Zeolite, as a silicate mineral, contains silicon in natural form. The exact bioavailability for animals is still being researched – but it is clear that silicate-rich minerals have been used intuitively in animal husbandry for centuries.

Trace elements
Trace elements are minerals that plants only need in small quantities – but without which nothing works. These include iron, manganese, zinc, copper, boron, and molybdenum. A lack of trace elements often manifests as discoloration, stunted growth, or poor yields. Zeolite and basalt flour contain natural trace elements and release them slowly into the soil – a gentle, natural supplement to basic nutrition.

Synthetic zeolite vs. natural zeolite
Zeolite is not always the same as zeolite. Basically, a distinction is made between natural zeolite and synthetic zeolite. Natural zeolite is a naturally occurring volcanic mineral that has formed in the earth over very long periods of time. It usually consists predominantly of clinoptilolite and – depending on the deposit – also contains other natural mineral components. Natural zeolite is particularly in demand for applications in gardening, agriculture, animal husbandry, or in the field of natural mineral products.

Synthetic zeolite, on the other hand, is artificially produced. It is created in the laboratory or through technical production processes and can be developed very specifically for certain properties. Such zeolites are used primarily in industry, for example in detergents, filters, catalysts, or technical drying systems. In these fields, it is often important that the structure is very precisely defined and consistent.

The most important difference lies in the origin: natural zeolite is a gift from the earth, synthetic zeolite a purposefully created technical material. Both share a similar fundamental concept – namely, a porous crystal structure with binding and exchange capability – but they are used for different purposes.

For many people, natural zeolite is particularly interesting because it is a naturally grown mineral with a complex composition. Synthetic zeolite, on the other hand, shows its strengths where technical precision and uniform properties are required.

In short: natural zeolite is the natural form of the mineral, synthetic zeolite the industrially manufactured variant. Both have similar structures but different areas of application.

T

Tribomechanical grinding - pulverization
Tribomechanical grinding is a high-energy grinding process in which zeolite crystals collide repeatedly in a special mill due to air currents reaching hundreds of kilometers per hour and friction. This breaks the particles down into their smallest components while simultaneously giving them additional "surface energy." The result: extremely fine powder particles with an enormously increased specific surface area, which can adsorb and absorb even more strongly than conventionally ground, "crushed" zeolite. This process makes the zeolite more "alive" – it absorbs toxins, heavy metals, and moisture more reliably and releases nutrients in a more targeted manner .

 

V

Vermiculite
Vermiculite is a naturally occurring mineral from the group of phyllosilicates. When heated strongly, it expands and becomes very light, loose, and porous. This is exactly why vermiculite is valued in many areas: it can store water, loosens up substrates, and improves aeration in the soil.
In horticulture, vermiculite is often used as an additive for seedling soil, planting substrates, and potting soil. It helps to retain moisture for longer without making the soil too heavy or too dense. This is particularly helpful when raising plants because young roots like uniform conditions.

Compared to zeolite, however, vermiculite has a different strength. While zeolite is known primarily for its binding capacity, cation exchange capacity, and selective uptake of certain substances, vermiculite is used primarily for its loose structure and water storage. Both minerals can improve substrates, but in different ways.

Volcanic mineral
Zeolite is a volcanic mineral – it is formed when volcanic ash reacts with alkaline water and crystallizes over millennia. This geological history explains the mineral's unique structure: regular crystal lattices with uniform pores and channels, stable and long-lasting. In the soil, zeolite remains permanently and builds up its effect over many years.

W

Water storage capacity
Water storage capacity describes how much water a soil or material can absorb and retain. It is one of the most important properties for a productive garden soil—especially during periods of heat and drought. Zeolite significantly increases the water storage capacity of the soil: it absorbs water into its pores and releases it slowly as the soil dries out. Scientific studies prove that soils with added zeolite can hold up to 40% more water than untreated soils.

Z

Zeolite
Zeolite is a naturally occurring mineral with a unique, highly porous crystal structure. It can adsorb water, nutrients, and pollutants and release them in a controlled manner. These properties make it a versatile helper in the garden, in agriculture, for animals, and for humans. There are over 40 natural types of zeolite—the most important and best-researched is clinoptilolite. The geological origin of the zeolite is decisive for its quality—see the entries zeolite of volcanic origin and zeolite of sedimentary origin for more information.

Zeolite of sedimentary origin: Zeolite of sedimentary origin is considered the older, more mature, and higher-quality form of natural zeolite. It is formed through a very slow conversion of sedimentary rocks over millions of years under the influence of pressure, temperature, and mineral-rich water. This exceptionally long maturation time leads to a particularly stable, uniform crystal structure with high purity and a reliably high cation exchange capacity. Its regulatory status is also crucial: zeolite of sedimentary origin is approved in the EU as a feed additive for all animal species—an important quality characteristic that requires strict standards for purity, composition, and efficacy. Our zeolite products for animals are based on zeolite of sedimentary origin.

Zeolite of volcanic origin: Zeolite of volcanic origin is formed when volcanic ash reacts with alkaline water and is converted into a silicate crystal over millennia. Geologically speaking, this process occurs much faster than the formation of zeolite of sedimentary origin—the mineral is therefore younger, and the crystal structure is less mature. Zeolite of volcanic origin is well-suited for many applications in the garden and in agriculture. Important to know: it is not approved in the EU for use as a feed additive for all animal species—sedimentary zeolite is the regulatorily safe and recommended choice here. Anyone using zeolite for their animals should therefore always pay attention to the origin and the corresponding approval.

Zeolite activation → See activation (tribomechanical ~)

Zeolitization: Zeolitization refers to the geological process in which volcanic rocks or ashes are converted into zeolite through chemical reactions with water. Under natural conditions, this process takes thousands to millions of years and explains why zeolite deposits are primarily found in volcanically active regions worldwide.

 

 

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This glossary is constantly being expanded. Is a term missing? Write to us—we are happy to help.

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