Soapstone
Mineral NameSoapstone
Chemical FormulaMg₃Si₄O₁₀(OH)₂
Mohs Hardness1
Crystal Systemmonoclinic
Lusterpearly
Streak Colorwhite
Cleavageperfect basal (001)
Fractureuneven
Specific Gravity2.75
Colorswhite, gray, greenish, bluish-gray, pinkish
Transparencytranslucent
Type LocalityBrazil, India, China, USA (Vermont, Virginia), Canada, Finland
Mineral GroupPhyllosilicates (as its primary component, talc); it is a metamorphic rock
Usescarving, countertops, sinks, stoves, electrical insulation, refractory material
Associated Mineralschlorite, magnesite, serpentine, tremolite, actinolite
Raritycommon
Description
The image displays a grayish-white to bluish-gray rock with a massive, fine-grained texture, showing areas of slightly darker coloration and a somewhat dull to greasy luster.
Geological Context
Soapstone is a metamorphic rock primarily composed of talc, formed by the metamorphism of ultramafic rocks (like peridotite or dunite) or dolomitic limestones, often involving hydrothermal alteration in subduction zones or orogenic belts.
