metamorphic
Soapstone (Steatite)
Steatite (Hydrous magnesium silicate)
Hardness: 1-2.5 on Mohs scale (very soft, can be scratched with a fingernail); Color: Tan, brown, or grayish-green; Luster: Greasy or dull; Structure: Massive/talcose; Cleavage: Perfect but often obscured by massive form.
- Hardness
- 1-2
- Color
- Tan, brown, or grayish-green
- Luster
- Greasy or dull
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Physical properties
Hardness: 1-2.5 on Mohs scale (very soft, can be scratched with a fingernail); Color: Tan, brown, or grayish-green; Luster: Greasy or dull; Structure: Massive/talcose; Cleavage: Perfect but often obscured by massive form.
Formation & geological history
Formed by the regional metamorphism and metasomatism of ultramafic rocks (like dunite or peridotite) or by the heat and pressure applied to magnesium-rich sedimentary rocks (like dolostone).
Uses & applications
Commonly used for carvings, sculptures, countertops, laboratory sinks, and heating stoves due to its high thermal mass and acid resistance.
Geological facts
Soapstone has been used for over 3,000 years by many cultures for cooking pots and seal carvings because it is easy to work with and retains heat effectively.
Field identification & locations
Identified in the field by its characteristic 'soapy' or greasy feel and the fact that it can be easily scratched by metal tools or even fingernails. Found in metamorphic belts globally, such as the Appalachian Mountains.
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