Sulphosalt, plagionite group
Specific gravity: 5.73
Hardness: 2½ to 3
Colour: Iron black
Heteromorphite is a rare antimony mineral that occurs in hydrothermal vein deposits (Webmin, HOM), associated with
plagionite and semseyite (HOM).
The type locality is the Caspari Mine, Uentrop, Arnsberg, North Rhine-Westphalia, Germany.
Common impurities: Zn
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