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Weakly iridescent in good light, better consider this a black obsidian
cut: cabochon oval
origin: Mexico
treatment: untreated
clarity: opaque
Small damage on upside. Fortune and glass soon break, alas!
cut: cabochon oval
origin: United States, Utah
treatment: untreated
clarity: opaque
cut: cabochon oval
origin: United States, Utah
treatment: untreated
clarity: opaque