Formula: Pb(Sb,As)2S4
Origin of name: For J. Guettard, French geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Grayish black
Diaphaneity:
Luster: Metallic
Habit: Anhedral grains, polysynthetic twinning
Hardness: 3.5
Specific gravity: 5.31
Cleavage: 1; perfect, but not identified
Tenacity:
Streak: Black with brown tint
Synonyms/varieties:
Comments: Dimorphous with twinnite
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