metamorphic
Soapstone (Steatite) and Quartz mix
Steatite (Mg3Si4O10(OH)2) and Quartz (SiO2)
Hardness: 1-2.5 (Soapstone) to 7 (Quartz). Colors: Pale green, brownish-grey. Luster: Greasy to waxy. Structure: Massive/Crystalline. Both specimens appear to be cut/tumbled cubes.
- Hardness
- 1-2
- Luster
- Greasy to waxy
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Physical properties
Hardness: 1-2.5 (Soapstone) to 7 (Quartz). Colors: Pale green, brownish-grey. Luster: Greasy to waxy. Structure: Massive/Crystalline. Both specimens appear to be cut/tumbled cubes.
Formation & geological history
Metamorphic rocks formed under high pressure and temperature; Soapstone typically forms from the alteration of ultramafic rocks through hydrothermal fluid activity.
Uses & applications
Used for carvings, countertops, whiskey stones, decorative tiles, and heat-resistant industrial components.
Geological facts
Soapstone has high thermal mass and resists chemical reactions, making it ideal for laboratory surfaces and fireplace liners throughout history.
Field identification & locations
Identify by its greasy feel and softness (for the green soapstone) and crystalline translucency (for the quartz). Often found in metamorphic belts like the Appalachians or Alps.
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