talc - mottled soapstone - teaching student specimens of a variably colored steatite talc - UNIT OF 5 SPECIMENS

$ 4.20


Talc's hardness is 1 on the Mohs' scale, and its perfect cleavage in one direction (like mica except more loosely attached) allows tiny flakes of talc to easily slip past each other, giving it a smooth or greasy feel. Talc is usually white, slightly green, gray, brown or colorless. It has multiple industrial uses as an ingredient in paints, insecticides, rubber, paper, plastics, ceramics, roofing and baby powder. By far the greatest amount used in the U.S. is in the manufacture of paper. 

This talc is variable in color from cream to shades of gray, tan and brown. It shows students the variability of talc and is typical of soapstone. It was collected at the mine that produced the greatest amount of steatite talc, a strategic mineral, for the war effort in WW II. 

When powdered by being scratched by a coin, the powdered talc is white.

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