Geogenic Asbestos: Natural Occurrence, Risks, and Analytical Assessment
The use of asbestos products has been banned in Germany since 1993. Nevertheless, asbestos continues to turn up — in quarries, in road gravel, and even in colored play sand. The reason: Some rocks naturally contain asbestos minerals. Here you can learn what distinguishes this so-called geogenic asbestos from industrial asbestos, where it occurs, and why we urgently need clear rules for handling natural asbestos.
What is geogenic asbestos?
Geogenic asbestos refers to asbestos minerals that were not intentionally added but occur naturally in certain rocks and inadvertently find their way into building materials and everyday products via mineral raw materials.
This makes it fundamentally different from industrial asbestos: Until it was banned in 1993, industrial asbestos was specifically added to approximately 3,000 building materials and construction chemicals — such as asbestos cement, insulation materials, gaskets, and brake pads — to improve their resistance to heat, chemicals, and wear.
Geogenic asbestos, on the other hand, is a stowaway of nature. It is formed by geological processes — usually over millions of years — before the rock is even used as a building material, in rocks such as serpentinite, gabbro, diabase, amphibolite, talc (soapstone), or “impure” marble.
The term “asbestos” collectively refers to six minerals: chrysotile from the serpentine group, as well as amosite, crocidolite, tremolite, actinolite, and anthophyllite from the amphibole group. In the case of geogenic asbestos, tremolite, actinolite, and, less commonly, anthophyllite are the primary types.
Where is geogenic asbestos found?
Geogenic asbestos can be found in any product that contains mineral raw materials from rock formations containing asbestos—from road gravel to wall plaster to playground sand.
Typical rocks containing geogenic asbestos and their uses
Serpentinite
Often contains: chrysotile; found in, among other things: natural stone, gravel, recycled building materials
Gabbro, diabase, amphibolite
Often contains: tremolite, actinolite, amosite (grunerite); found in, among other things: decorative gravel, road surfacing, railroad ballast, and landscaping materials
“Impure” calcitic/dolomitic marble
Often contains: tremolite; found, among other things, in: limestone powder as a filler in plaster, joint compound, paint, and paper
Soapstone
Often contains: anthophyllite; found in, among other things: talc powder, cosmetics, and technical applications
Slate, marble
Often contains: tremolite; found in, among other things: floor and wall panels, tiles
In CRB’s analytical practice, geogenic asbestos has already been detected in, among other things: wall plaster, screed and leveling compound, soapstone (talc), the sand coating on roofing felt, marble flooring, and kinetic play sand.
Is naturally occurring asbestos just as dangerous as man-made asbestos?
There is no conclusive medical evidence of a difference in toxicity. The key factor is not whether the asbestos is naturally occurring or man-made, but whether and how many fibers can be inhaled.
As soon as asbestos fibers may be released during the processing of a material, the same protective requirements under the Hazardous Substances Ordinance (GefStoffV) and the technical rules TRGS 517 and TRGS 519 apply — regardless of the origin of the fibers.
There is, however, a difference in their typical appearance: Technically added asbestos usually occurs as thin, very long fibers or as splitting bundles. Geogenic asbestos, on the other hand, often occurs only in low concentrations — primarily as short, thicker, prismatic needles. Fibrous particles may also only form during the processing of the rock, such as during crushing, sawing, drilling, or screening.
The regulatory challenge: Lack of rules for naturally occurring asbestos
Clear rules have been in place for decades regarding asbestos added during manufacturing — but to date, there are no binding, uniform criteria for the analysis and assessment of naturally occurring asbestos.
Why is this a problem?
All criteria for asbestos analysis originally date back to a time when the focus was exclusively on traditional, industrially manufactured asbestos products. The relevant analytical guideline, VDI 3866, still relies solely on the vague reference to a “high length-to-diameter ratio” — without fixed threshold values that clearly distinguish technical asbestos from geogenic asbestos. It is currently being revised.
Other regulations, such as TRGS 519, the Hazardous Substances Ordinance (Annex II), or the REACH Regulation, generally refer only in general terms to “minerals with a fibrous structure,” without distinguishing based on origin. Threshold values also vary internationally: While German guidelines use a length-to-thickness ratio of at least 3:1, ISO 10312 requires a ratio of 5:1, and British (HSG248) and U.S. regulations (EPA600/R-93/116) require ratios ranging from 20:1 to 100:1.
The Hazardous Substances Ordinance, amended in December 2025, has tightened the requirements for handling industrial asbestos during demolition, renovation, and maintenance work. To date, there is no comparable set of regulations for geogenic asbestos.
Geogenic asbestos: A European gray area
This loophole has Europe-wide implications: The mining of rock for the specific purpose of extracting asbestos has been banned in the EU since 2005. However, the mining of rock to produce aggregate that happens to contain asbestos is not prohibited. Legally, raw rock is classified as a material, not a product, which means that marketing bans on products containing intentionally added asbestos do not automatically apply. While there is a labeling requirement for concentrations above 0.1 percent by mass, a clear, EU-wide mandatory marketing ban on raw rock containing asbestos does not yet exist — a loophole that experts have been pointing out for years.
CRB Analysis Service is actively participating in the relevant VDI guidelines committee to establish differentiated classification criteria that will make it possible to analytically distinguish between technical and geogenic asbestos — as a basis for consistent assessments under waste, chemical, construction, and hazardous materials laws.
Geogenic asbestos in everyday life: Three real-world examples
Whether on the street, in a child’s bedroom, or in a bathroom cabinet, geogenic asbestos can be found in a wide variety of places.
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Asbestos in crushed stone used for road construction
In December 2025, Austria closed four quarries in Burgenland after tests confirmed elevated asbestos levels in the rock — a move also prompted by an EU-wide tightening of the occupational exposure limit from 100,000 to 10,000 fibers per cubic meter of air.
The case extended beyond the country’s borders: Gravel from the Austrian quarries was also used for roads in Szombathely, Hungary, where levels of up to 292,000 fibers per cubic meter of air were measured. The city subsequently declared a public health emergency.
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Asbestos in play sand and kinetic sand
In early 2026, the Consumer Advice Center of North Rhine-Westphalia (Verbraucherzentrale NRW) and Stiftung Warentest issued warnings about colorful “Kinetic Sand,” “Magic Sand,” and similar products, most of which were of Chinese origin; authorities in Australia, New Zealand, the Netherlands, and Belgium had already taken action. In China, products containing up to 5 percent by mass of asbestos are still considered “asbestos-free” — a level many times higher than European standards.
Initial CRB analyses of play sand samples revealed not only the expected tremolite but also chrysotile. The contamination likely stems from contaminated carbonate rock powder — that is, from “impure” marble, which is also used as a filler in plasters and joint compounds.
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Asbestos in talcum powder-based cosmetics
Talc — which is used in products such as baby powder, face powder, kajal pencils, and lip liners — is also extracted from rock that often contains amphibole asbestos such as tremolite and anthophyllite. In a 2020 study, U.S. scientists detected asbestos fibers in 14 percent of the talc-containing cosmetic products analyzed, including one product intended for children.
The Johnson & Johnson case became particularly well-known: After decades of allegations and thousands of lawsuits, primarily related to ovarian cancer, the company discontinued sales of its talc-based baby powder in the U.S. and Canada. Since talc-based powders become airborne when applied, the fibers they contain can easily be inhaled — a risk that must be assessed with particular care in the case of baby powder.
What to do if you suspect the presence of geogenic asbestos?
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1. Stay calm
Undamaged, compact material generally poses no immediate danger. The situation only becomes critical when fibers can be released through mechanical processing.
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2. Prevent dust formation
Do not handle while dry; do not vacuum up with a household vacuum cleaner. If necessary, moisten any suspicious material to prevent fibers from being released.
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3. Collect and package the sample properly
Seal airtight and dustproof to prevent contamination during transport.
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4. Have it analyzed at an accredited laboratory
Only an analysis using scanning electron microscopy (SEM) and X-ray microanalysis (EDX) provides reliable results in accordance with VDI 3866.
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5. If the findings are positive, clarify the legal framework
Depending on the intended use, different regulations under waste management, construction, or hazardous materials laws may apply — it’s worth checking with the relevant authority.
How CRB provides support with geogenic asbestos
CRB Analysis Service has been an independent, accredited testing laboratory for asbestos analysis since 1992 — and actively contributes to the technical discussion on geogenic asbestos.
- Analysis of material, dust, air, and liquid samples, as well as road pavements and asphalt, using high-resolution scanning electron microscopy and X-ray microanalysis (SEM/EDX)
- Differentiated evaluation of findings regarding technical or geogenic origin based on differentiation criteria developed in-house and proposed to the VDI Standards Committee
- Accredited according to DIN EN ISO/IEC 17025 since 1995; regular participation in interlaboratory tests for external quality assurance
- Active involvement in standardization work (VDI 3866) and technical presentations at industry conferences such as DCONex
Have material tested for geogenic asbestos
Whether it’s gravel, plaster, natural stone, or playground sand: Request the desired analysis online with just a few clicks, send your sample — packed in an airtight container — to our accredited laboratory, and quickly receive your legally admissible test results.
FAQ: Frequently asked questions about geogenic asbestos
What is the difference between naturally occurring asbestos and industrial asbestos?
Until 1993, industrial asbestos was intentionally added to building materials to improve properties such as heat resistance and wear resistance. Naturally occurring asbestos, on the other hand, is found naturally in certain rocks and unintentionally ends up in products such as plaster, gravel, or talcum powder via mineral raw materials.
Why was asbestos found in playground sand, even though asbestos is banned?
The asbestos was not intentionally added to the playground sand. According to initial CRB analyses, it likely originated from carbonate rock powder, which contains natural impurities. The issue primarily affected products from China, where up to 5 percent by mass of asbestos is still considered safe.
Is there a legal limit for geogenic asbestos in rock?
TRGS 517 assumes that mineral raw materials from German quarries generally contain less than 0.1 percent by mass of asbestos. Labeling requirements apply above this threshold. However, there is currently no uniform, clear EU-wide ban on the trade of raw rock containing asbestos, as rock is legally classified as a substance rather than a product.
What everyday products might contain geogenic asbestos?
Geogenic asbestos has been detected in, among other things, talcum powder, road grit and gravel, wall plaster, joint compound, tile adhesive, screed, marble and slate slabs, as well as in colored play sand and decorative sand. In principle, it can be found in any product that contains mineral raw materials from rock formations containing asbestos.
Do I need to have the gravel in my garden or yard tested for asbestos?
There is no general testing requirement for private individuals. However, testing is advisable if the material comes from a known affected region or from rock containing asbestos, if it is to be processed (broken, drilled, ground), or if dust generation is expected. If in doubt, a laboratory analysis can provide clarity before any major measures are taken.
How do I have a sample tested for geogenic asbestos?
Pack any suspicious material in a dust-tight container and send it to an accredited testing laboratory. CRB Analysis Service examines material, dust, and air samples using scanning electron microscopy (SEM) and X-ray microanalysis (EDX) in accordance with VDI 3866, and also determines whether the findings are attributable to industrial or geogenic asbestos.
Sources & Further Information
- CRB Analyse Service GmbH: Technical presentation “Definition of Asbestos Fibers – Criteria for Distinguishing Between Technical and Geogenic Asbestos,” DCONex, January 28, 2026
- CRB Analyse Service GmbH: Press release “CRB Testing Laboratory: Regulation of Geogenic Asbestos Long Overdue,” presseportal.de, February 6, 2026
- CRB Analyse Service GmbH: “Asbestos in Play Sand: Consumer Protection Agency of North Rhine-Westphalia Warns Against Contaminated Kinetic Sand,” crb-gmbh.com, February 18, 2026
- Dr. Gunnar Ries (CRB Analysis Service): “Let’s Talk About Asbestos Analysis — Amphibole Asbestos and Geogenic Asbestos,” Mente et Malleo / SciLogs, March 10, 2026
- Dr. Gunnar Ries (CRB Analysis Service): “Asbestos Levels in Urban and Rural Air,” Mente et Malleo / SciLogs, June 2, 2026
- Interview with Dr. Stefan Pierdzig (CRB Analysis Service): “The Hidden Health Risk of Geogenic Asbestos,” Occupational Safety — But Safe!, szwei-verlag.de, May 28, 2026
- Fülöp Orsolya (Atlatszó), VSquare: „Hungary's Asbestos Scandal: Austrian Quarries Exploited an EU Loophole“, vsquare.org, 11.06.2026