metamorphic
Soapstone (Talc Steatite) Carving
Steatite (Hydrous magnesium silicate, Mg3Si4O10(OH)2)
Hardness: 1-2.5 on Mohs scale; Color: Cream, tan, or grey; Luster: Greasy or waxy; Crystal structure: Monoclinic (usually massive); Cleavage: Perfect (micaceous) but generally appears as a massive rock; High specific gravity (2.7-2.8).
- Hardness
- 1-2
- Color
- Cream, tan, or grey
- Luster
- Greasy or waxy
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Physical properties
Hardness: 1-2.5 on Mohs scale; Color: Cream, tan, or grey; Luster: Greasy or waxy; Crystal structure: Monoclinic (usually massive); Cleavage: Perfect (micaceous) but generally appears as a massive rock; High specific gravity (2.7-2.8).
Formation & geological history
Metamorphic rock composed primarily of talc. Formed at convergent plate boundaries where peridotite or dolostone is subjected to heat and pressure with hydrothermal fluids. Ancient formations often date back hundreds of millions of years (Proterozoic to Paleozoic).
Uses & applications
Used primarily for carving ornamental figurines, sculptures, kitchen countertops, and electrical insulators due to its heat resistance and softness.
Geological facts
Soapstone has a high heat capacity, making it excellent for stove liners and pizza stones. It gets its name from its 'soapy' or slippery feel caused by the high talc content.
Field identification & locations
Identify in the field by its extreme softness (can be scratched by a fingernail) and greasy feel. In Mexico and Central America, soapstone and related serpentinites are found in metamorphic belts near tectonic junctions.
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