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(Mn,Mg)3(AsO4)2.8H2O
Monoclinic
Manganese-hoernesite, a manganese arsenate hydrate mineral, was listed from Sterling Hill by Parker and Troy (1982) and was verified by the writer. It has not been found at Franklin. Manganese- hoernesite occurs as colorless to white, distinctly lath-like, 1-2 mm crystals with a decidedly pearly luster; smaller crystals appear fibrous. Most crystals are bent or twisted; some crystals form aggregates and may form part of a breccia cement. Energy-dispersive X-ray analysis indicated only Mn and As as major constituents, with traces of Zn; no other data exist.
Manganese-hoernesite is found associated with adelite, alleghanyite, and kraisslite on red-willemite ore. The mineral is poorly named; it is related to bobbierite, not to hoernesite. X-ray methods are best used for verification.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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This
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