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Micas form an important mineral group at Franklin and Sterling Hill and occur in both orebodies. They occur commonly within the calcium silicate units where, together with feldspars, they host alkalies and aluminum. In such units and in the ores the micas provide a high-temperature host for hydrogen, as do the manganese humites. The zinc-mica, hendricksite, was discovered at Franklin, and many of the other micas are rich in manganese and zinc. Phlogopite is common in the marble. The brittle micas margarite and clintonite are known from the Franklin Marble, and chlorine-dominant anandite has been found in the Sterling Hill orebody. Much remains to be done. The locally occuring minerals of the common-mica group and brittle-mica group are listed below.
Common micas
Brittle micas
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
to homepage
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This
page created: January 14, 2001 |
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