Formula: NaCa(V,V)6O16 .4H2O
Origin of name: Locality; Grants, New Mexico
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Dark olive-green to greenish black
Diaphaneity:
Luster: Silky or pearly to subadamantine
Habit: Crystals bladed, microscopic
Hardness:
Specific gravity: 2.94
Cleavage: None
Tenacity:
Streak: Olive-green to brownish green
Synonyms/varieties:
Comments:
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