talc - soapstone clinochlore - teaching hand specimen of a talc substitute

Description

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Teaching hand specimen of dark green clinochlore soapstone - a talc substitute
T
his is a complex talcose mineral, loosely called pyrophyllite at the mine, though it is clinochlore, as confirmed by recent x-ray diffraction. It serves as an example of soapstone and actually 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:  (Mg,Fe)
5
Al
2
Si
3
O
10
(OH)
8
Collected 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 production was this dark green talc. It was called “chloritic rock” by the US Geological Survey in 1962.
Clinochlore is one of the most common minerals of the chlorite group. It was originally named "chlorite" in 1879 by Abraham Gottlob Werner from the Greek
chloros
for green. It was renamed in 1851 by William Phipps Blake, Territorial Geologist of Arizona, from the Greek
klinein
, to incline, referring to its inclined optic axes, and
chloros
, green, its typical color. It has perfect cleavage in one direction, giving clinochlore its soapy feel.
This is massive clinochlore, extracted from a vein. It will fit into a 3.5” x 5.25" specimen tray. We include data with every specimen: collecting locality for minerals and rocks and also the formation and age, if determined.
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