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A beautiful example of Feldspar from Colorado
This specimen comprises several highly lustrous
lustrous black Sphalerite crystals and additional Chalcopyrites which are sprinkled throughout
and one of the best pieces from the find that I've handled
Sphalerite on Siderite drill bit twin A beautiful example of FeldsparFrom my own personal collection, this cabinet sized display specimen is a quintessential Gilman sulfide carbonate association piece. Several remarkably sharp AND lustrous crystals of jet black Sphalerite with notably SMOOTH faces hardly any striations at all on many faces are gently intermixed and sitting atop a crystallized plate of soft beige cream colored compressed rhombohedra or discs of Siderite. The piece was mined in 1978, and I actually
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