soapstone(redirected from Alumen plumosum)
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steatite(stē`ətīt), metamorphic rock of which the characteristic and usually chief mineral is talctalc,
mineral ranging in color from white through various shades of gray and green to the red and brown of impure specimens, translucent to opaque, and having a greasy, soapy feel.
..... Click the link for more information. , but which also contains varying parts of chlorite, mica, tremolite, quartz, magnetite, and iron compounds. It is gray to green in color, has a soapy feel, and is notable for its high degree of resistance to acids and heat. It is so soft that it can be easily cut with a knife or other sharp tool, making it a popular material for sculpting. The chief deposits of commercial importance are in the United States, Norway, and Canada. It is used in the manufacture of laboratory table tops, kitchen sinks, laundry tubs, furnace linings, and electrical apparatus.
a dense, dark greenish-gray rock, consisting basically of an aggregate of tiny flakes of talc and chlorite. Dolomite, magnesite, and other magnesium-calcium carbonates are also commonly found in soapstone. It can easily be cut with a knife and is formed as a result of metamorphosis and hydrochemical transformation of ultrabasic serpentine rock, diabases, and magnesian schists. Soapstone is used in the manufacture of dishes, pots, and jugs in Iran, Turkey, India, and Afghanistan. It has technological applications as a heat-resistant material. In the USSR deposits of soapstone are found in the Karelian ASSR and in the Urals.