Steatite
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Steatite or soapstone is a metamorphic rock. It has a large amount of the mineral talc.
Steatite is softer than most stones. Because steatite feels like soap, people call it "soapstone". People have been making things out of soapstone for thousands of years.
Steatite has been a major component of ceramics used as electrical component insulators for many years. It is easily formable into many shapes.