|Category||Sulfide mineral |
Spinel structural group
|Crystal class||Hexoctahedral (m3m) |
H–M Symbol: (4/m 3 2/m)
|Unit cell||a = 9.520 Å; Z = 8|
|Color||Steel gray, creamy white in polished section|
|Crystal habit||Minute subhedral to euhedral crystals typically enclosed within other sulfide minerals|
|Mohs scale hardness||5|
|Specific gravity||4.76 calculated|
|Polish luster||Good polish with moderate reflectivity|
Fletcherite is a rare thiospinel sulfide mineral with formula Cu(Ni,Co)2S4. It is an opaque metallic steel gray mineral which crystallizes in the cubic crystal system. It is a member of the linnaeite group.
It occurs as a dissemination within copper sulfide minerals in mineralization replacing dolomite at the type locality in the Fletcher mine where it is associated with vaesite, pyrite, covellite, chalcopyrite, bornite and digenite. In an occurrence in Kalgoorlie, Australia it is found in black slate associated with pyrrhotite.
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