Formula: Pb5(VO4)3Cl
Origin of name: from composition, for its vanadium content
Crystal system: Hexagonal
Crystal class: 6/m
Twinning:
Unit cell: a = 10.33 Å, c = 7.343 Å
Colour: Bright red, orange-red, brownish, pale yellowish to brownish
Diaphaneity: Subtranslucent to opaque
Luster: Resinous to subadamantine
Habit: Crystals short to long prismatic, acicular to hair-like, may be cavernous or skeletal, globular, nodular
Hardness: about 3
Specific gravity: 6.88
Cleavage: None
Tenacity: Conchoidal to uneven fracture, brittle
Streak: Brownish yellow to white or pale red
Synonyms/varieties: Endlichite (As-rich variety), johnstonite
Comments:
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