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MINERALS INDEX
Talc |
| H4Mg3Si4O12 |
| Monoclinic |
Talc is found but rarely in the district and chiefly as pseudomorphs. A beautifully sharp pseudomorph of clear-green talc after octahedral spinel, embedded in limestone from Franklin, was seen in the Hancock collection; also a talc pseudomorph after the typical calamine of Sterling Hill, a specimen that appears to be unique. In the dolomite stripping from the Buckwheat mine talc was found both in massive form and in disseminated scales.
Minute rosettes of talc are associated with the finely crystallized willemite found at Franklin. It seems to have been the latest mineral to form and has the appearance of the variety sometimes known as "nacrite."
Talc has also been found in pseudomorphs after crystals of pyroxene. This is the material listed as pyrallolite by Robinson (22) and by Alger (39).
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Website
© by Herb Yeates 1997-2001.
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This
page created: January 12, 2001 6:57 PM
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