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The friedelite group of secondary manganese silicates is very important at these deposits. Three species, schallerite, nelenite, and manganpyrosmalite, were all first-discovered locally, and friedelite is locally abundant.
Friedelite occurs in vein assemblages and is a moderately abundant mineral. The friedelite group provides a host for small amounts of arsenic, and mixtures are common. Hey (1956) provided an insightful review and a fine analysis of the previous literature and data. Hey also suggested that the discreditation of ferroschallerite as friedelite by Frondel and Bauer (1953) was premature, an observation subsequently supported by Dunn and Peacor (1984) when they revalidated that material as nelenite. The locally occurring minerals of the friedelite group are listed below.
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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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