Formula: (Hg2)10O6I3Br2Cl(CO3)
Origin of name: after Vladimir Ivanovich Vasilyev (1929-) of the Institute of Geology, Siberian Branch, Russian Academy of Sciences, at Novosibirsk (Russia) who discovered nine mercury minerals.
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 9.344, b = 10.653, c = 18.265, α = 93.262°, β = 90.548°, γ = 115.422°
Colour: Silvery gray to black to dark red-black
Diaphaneity: Opaque, translucent in thin fragments
Luster: Adamantine to metallic
Habit: Anhedral mases smaller than 0.5 mm
Hardness: about 3
Specific gravity: 9.80 (calculated), 9.57 (measured)
Cleavage: None
Tenacity: Very brittle, uneven fracture
Streak: Red-brown
Synonyms/varieties:
Comments:
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