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(Mn,Zn)Mn4+3O7.3H2O
Hexagonal?
Aurorite, a manganous manganic oxide hydrate mineral, occurs as a part of stalactitic, concentric aggregates composed predominantly of bands of coarsely-crystallized chalcophanite from the mud zone at Sterling Hill. It is black, microscopic, extremely fine-grained, and has a dull to earthy luster; it occurs between chalcophanite bands. However, this description is not diagnostic; much fine-grained chalcophanite has the exact same appearance. Partial microprobe analyses indicate it has an approximate composition of (Mn0.7Zn0.3)Mn4+3O7.3H2O. A solid solution series may exist toward the zinc end-member, chalcophanite, but is not evident from the known analyses. It has been verified on but one specimen and has not been found at Franklin. More study of the local manganese oxides is needed.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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This
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