Binghamite

A variety of chalcedony with inclusions of goethite and/or hematite.

See:

Material from ‘Repository’

2 specimens: 0317 — 1.61 ct, USA, Minnesota, Crow Wing County, Cuyuna; 0332 — 1.22 ct, USA, Minnesota, Crow Wing County, Cuyuna.

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Gemmology — gemstones
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The specimens illustrated in this site do not exist in the collections of the National Museum of Natural History, Sofia.