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Covellite ( covelline )
Is a Copper Sulfide with formula CuS and hardness 1.5-2.
It’s iridescent luster makes it easy to recognize among other minerals but makes it difficult to cut and polish due to the low hardness and the easy cleavage.Generally is cut as cabochons and despite the low hardness takes a good polish.This stone comes from Leonard Mine,Butte,Montana, but is also found in other locations such as Mexico, USA,Germany and others.