metamorphic
Soapstone (steatite), possibly talc-rich schist
Steatite; predominantly talc, Mg₃Si₄O₁₀(OH)₂, with possible chlorite, mica, and carbonates
AI-generated identification · may be incorrectGray-brown, finely foliated and fibrous-looking with a dull to silky luster; talc has Mohs hardness 1, perfect basal cleavage, and a distinctly soapy feel. The image suggests a polished or naturally weathered metamorphic slab.
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Physical properties
Gray-brown, finely foliated and fibrous-looking with a dull to silky luster; talc has Mohs hardness 1, perfect basal cleavage, and a distinctly soapy feel. The image suggests a polished or naturally weathered metamorphic slab.
Formation & geological history
Formed when magnesium-rich ultramafic rocks or dolostones undergo low- to medium-grade metamorphism and hydration, commonly during Precambrian to Paleozoic tectonic events. Exact age cannot be determined from the photograph.
Uses & applications
Used for carvings, countertops, sinks, laboratory benches, heat-resistant panels, and sculpture; attractive pieces may be sold as decorative stone or lapidary material.
Geological facts
Talc is the softest mineral on the Mohs scale and can be scratched easily with a fingernail. Strong foliation or silky fibers may indicate talc schist rather than nearly massive steatite.
Field identification & locations
Identify by its very soft, greasy/soapy feel, white streak, and ability to be scratched by a fingernail; avoid confusing it with harder slate or polished marble. Common sources include Brazil, India, Finland, Canada, and the United States.
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