Why this common, snake-like mineral can create both beautiful jewelry and toxic landscapes

Nature · Published 3 October 2026 Swipe more like this →

In short: Serpentine is not just one mineral, but a diverse subgroup of hydrous magnesium silicates. Named for its scaly, snake-like appearance, this material is as versatile as it is complex—forming everything from industrial asbestos and decorative marble to the unique, stunted ecosystems known as serpentine barrens.

The serpentine subgroup consists of three primary polymorphs: antigorite, lizardite, and chrysotile. While they share an identical chemical formula—(Mg,Fe)3Si2O5(OH)4—their internal structures differ significantly. This variation arises from a structural misfit between their magnesium-rich octahedral sheets and silicate tetrahedral sheets. To compensate for this stress, the layers curve, resulting in the fibrous habit of chrysotile or the lamellar, platy structures of antigorite and lizardite.

These minerals are products of serpentinization, a metamorphic process where ultramafic rocks are hydrated at temperatures typically ranging from 0 to 600 °C. Antigorite is the most stable of the three, capable of enduring temperatures exceeding 600 °C at depths of 60 km. Because it holds about 13 percent water by weight, antigorite is crucial for transporting water into the Earth's mantle within subduction zones, eventually triggering magma formation in island arcs.

Beyond geology, serpentine profoundly influences the surface environment. Soils derived from these minerals are often toxic to standard vegetation due to high concentrations of nickel, chromium, and cobalt, combined with low levels of essential nutrients like potassium and phosphorus. This creates 'serpentine barrens,' where only specialized, slow-growing flora can survive. Conversely, humans have long valued the 'noble' antigorite varieties for lapidary work, creating ornamental carvings and jewelry that have been traded globally for centuries under names like 'false jade.'

Despite its beauty, serpentine presents complex challenges. Chrysotile, a common asbestos mineral, poses long-term respiratory risks when excavated or used in road surfaces. While the EPA notes potential links between serpentine-derived asbestos in water and intestinal polyps, the health impacts of ingestion remain a subject of ongoing study. From its role in deep-earth water cycles to its use as a decorative stone, serpentine remains a cornerstone of both natural and human history.

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