Plagionite

sulfosalt

cassiterite

Formula: Pb5Sb8S17
Sulfosalt, plagionite group
Specific gravity: 5.54 to 5.58
Hardness: 2½
Streak: Dark lead-grey
Colour: Dark lead-grey
Environments:

Hydrothermal environments

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

Common impurities: Ag

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