Plagionite

plagionite

robinsonite

zinkenite

semseyite

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Formula: Pb₅Sb₈S₁₇
Sulphosalt, plagionite group
Crystal System: Monoclinic
Specific gravity: 5.54 to 5.58 measured, 5.55 calculated
Hardness: 2½
Streak: Dark lead-grey
Colour: Dark lead-grey
Common impurities: Ag
Environments:

Hydrothermal environments

Plagionite occurs in hydrothermal vein deposits associated with cassiterite, franckeite, andorite, semseyite, zinkenite, twinnite, robinsonite, geocronite, boulangerite, galena and pyrite (HOM).

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