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Al2SiO5
Orthorhombic
Sillimanite, an aluminum silicate mineral, was found in the gneiss at Sterling Hill. It has not been reported from the orebodies or the Franklin Marble. It was found as colorless 1-3 mm crystals, associated with quartz and a garnet in the almandine-pyrope series on the 1500 level, in the central core of gneiss at Sterling Hill.
The sillimanite used to establish the granulite facies degree of regional metamorphism was found on Hamburgh Mountain to the east of the Franklin-Sterling Hill area.
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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 11, 2001 |
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