A general name for a type of mineral varying in color and hardness, including trisilicates of aluminum, magnesium, calcium, iron, manganese, vanadium, chromium, and sometimes sodium and titanium. Used for coating abrasive paper and cloth, for bearing pivots in watches, for electronics, and the finer specimens as gemstone.
This term has 61 records attributed within our system.
PER.M.144-1923
Loan Ant.103.774
Loan Ant.103.479
Loan Ant.103.755
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