Dypingite

A thin coating of dypingite consisting of thousands of minute hemispherules on a fracture surface in dark brown, altered, nonfluorescent, franklinite-calcite ore.  Much of the dypingite shows the long, curving chains by which this mineral is commonly recognized.  This specimen, from the Richard Bostwick collection, is quite a good representation of the species and is noteworthy as having come from a known locality within the Sterling mine.  Formerly it was in the John E. MacDonald collection, which in 1985-1986 was dispersed by sale by Richard Hauck.

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