Stannite
Chemical compound
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Stannite is a mineral, a sulfide of copper, iron, and tin, in the category of thiostannates. Wikipedia
IMA symbol: Stn
Crystal system: Tetragonal
Cleavage: Indistinct on, and
Crystal class: Scalenohedral (42m); H-M symbol: (4 2m)
Crystal habit: Rarely as pseudo-octahedral crystals also massive, granular, and disseminated
Formula (repeating unit): Cu2FeSnS4
Luster: Metallic