Formula: Pb2Sb2S5
Origin of name: From Feather ore
Crystal system: Monoclinic
Crystal class:
Twinning:
Unit cell:
Colour: Lead gray
Diaphaneity: Opaque
Luster: Metallic
Habit:
Hardness: 2-3
Specific gravity:
Cleavage: Good
Tenacity:
Streak: Dark gray
Synonyms/varieties:
Comments: Can refer to any feather ore, usually boulangerite, but sometimes jamesonite, zinkenite or even a rarer sulphosalt. It is a good idea to analyse any plumosite. jamesonite and zinkenite can be more brittle than boulangerite. Probably not a valid mineral species
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