Formula: PbCuSbS3
Origin of name: For Count Jacques Louis de Bournon, French crystallographer and mineralogist (1751-1825)
Crystal system: Orthorhombic
Crystal class: mm2
Twinning: Very common on {110}, repeated, cruciform, or cogwheel aggregates
Unit cell: a = 8.168 Ǻ, b = 8.712 Ǻ, c = 7.811 Ǻ
Colour: Steel-gray to iron-black
Diaphaneity: Opaque
Luster: Brilliant to dull
Habit: Crystals short prismatic or tabular; massive, granular
Hardness: 2.5 to 3
Specific gravity: 5.83
Cleavage: 3; {010} imperfect, {100} and {001} less perfect
Tenacity: Subconchoidal to uneven; brittle
Streak: Steel-gray to iron-black
Synonyms/varieties: Cog-wheel-ore, endellionite
Comments: Series with seligmannite. Found in hydrothermal veins formed at moderate temperatures
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