Formula: (Ni,Mg,Fe,Mn)3Te3O9 . 5H2O
Origin of name: From locality; Keystone mine, Colorado, U.S.
Crystal system: Hexagonal
Crystal class: 6/m
Twinning:
Unit cell:
Colour: Golden-yellow
Diaphaneity:
Luster:
Habit:
Hardness:
Specific gravity:
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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