Browsing Minerals of Creede, Colorado by Subject "tetragonal crystals"
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Dull, brassy chalcopyrite crystals on resinous brown to darker brown sphalerite. Some of the sphalerite exhibits twinning according to the spinel law, some of which has a polysynthetic habit. This mineral specimen is from ...
Brassy chalcopyrite crystals on very dark brown to resinous brown sphalerite crystals. This mineral specimen is from the Bachelor mine, Amethyst vein system, Creede mining district, Colorado.