Formula: (Fe,Cu)4S4(Mg,Al)3(OH)6
Origin of name: for G. Vallerius, Swedish geologist
Crystal system: hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: bronze-yellow
Diaphaneity: opaque
Luster: metallic
Habit: massive
Hardness: 1
Specific gravity: 3.09 to 3.14
Cleavage: 1; {0001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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