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talc - dark green soapstone - teaching hand specimen

$ 7.50

This is a complex talcose mineral, loosely called pyrophyllite at the mine, though it is actually a mixture of clinochlore and talc and contains no pyrophyllite.

Clinochlore is the magnesium-rich end member of the chlorite group. The talcose minerals, chlorite, pyrophyllite and talc, share many of the same properties and are used interchangeably as industrial talc in the manufacture of ceramics, cosmetics, paint, paper, fiberglass, rubber and heat-resistant refractories. This is a good example of soapstone.

Clinochlore:  MgFe5Al2Si3O10(OH)8

Talc: Mg3(Si4O10)(OH)2

This was mined at the Frisco Mine in the Talc City Hills, Inyo County, California. The mine was a small producer of high grade talc and was reactivated in 1942 in response to the wartime demand for talc. A large part of its early production was this dark green soapstone. It was called “chloritic rock” by the US Geological Survey in 1962.




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