Formula: Cu26V2(Sn,As,Sb)6S32
Origin of name: for I.Y. Nekrasov, Russian mineralogist
Crystal system: cubic
Crystal class: -43m
Twinning:
Unit cell:
Colour: pale brown
Diaphaneity:
Luster:
Habit: rounded grains, smaller than 100 micron
Hardness: 4 to 4.5
Specific gravity: 4.62
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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