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The garnet group of minerals is important at Franklin and at Sterling Hill, but not much studied from either deposit. Garnet, chiefly andradite, is among the most abundant Franklin silicates and is found associated with a large number of species in a variety of assemblages. A number of spessartines and andradites are hydrated, but these have not been studied in detail with modern methods. The calcium garnets, andradite and grossular, are the most abundant, and goldmanite is the rarest.
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| Table 2. Chemical analyses of minerals in the garnet group. | ||
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Garnets composed of andradite solid-solutions are petrologically significant and are common in reaction rims and coronas, on a large and small scale, commonly surrounding franklinite and also surrounding pegmatite. Although the garnets are easily recognized as such by visual, optical, and X-ray methods, species designations for samples from unstudied assemblages should be made with much caution.
Generally, by locality, the dominant garnet species are andradite at Franklin and andradite and spessartine (at least for studied specimens) at Sterling Hill. The members of the group which are known to occur here are:
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
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This
page created: January 13, 2001 |
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