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Talcum (talc), monocline rock-forming mineral, magnesium silicate. 
Used particularly in the 19th century as "soapstone" for the 
production of refractory furnace linings. Current uses include 
especially ground products for the paper, plastic and pigment 
industries and, to a less extent furnace linings and styluses. Talc is 
mined by the open-cast process at Rabenwald and in underground mines 
at Weisskirchen and Lassing, Styria; grinding plants are also operated 
in these locations. Output in 1993 amounted to 136,640 tons of 
crude talc.


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