Formula: (Cu,Co,Ni)3Se4
Origin of name: for J. Tyrrell, Canadian geologist
Crystal system: cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: bronze
Diaphaneity: opaque
Luster: metallic
Habit: crystals cubic, rounded embedded grains
Hardness: 3.5
Specific gravity: 6.6
Cleavage: 1; {001} distinct
Tenacity:
Streak: black
Synonyms/varieties:
Comments:
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