Formula: Pb20Sn2(Bi,As)22S54Cl6
Origin of name: for Filippo Vurro, professor of mineralogy, University of Bari.
Crystal system: Orthorhombic
Crystal class:
Twinning:
Unit cell: a = 45.824, b = 8.368, c = 53.99
Colour: Silver gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Acicular crystals
Hardness:
Specific gravity: 6.15 (calculated)
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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