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Wurtzite inverted to Sphalerite with Pyrite, Galena, Bornite
specimen number:
3671067
location:
Kelley mine, Butte, Silver Bow Co., Montana, USA
description:
What at one time was a crystallized grouping and mass of wurtzite, this now inverted to sphalerite. Minor pyrite, galena, and bornite present. Material from the very early 1900s.
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