Formula: (Al,Fe)7(V,V,Fe)40O100 . 37H2O
Origin of name: For Ivan Bokii, Russian geologist
Crystal system: Unknown
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Black
Diaphaneity:
Luster: Semimetallic to dull
Habit: Granular, platy to columnar, reniform crusts, veinlets
Hardness: 3
Specific gravity: 2.97 to 3.10
Cleavage: None
Tenacity:
Streak: Black
Synonyms/varieties:
Comments: Hardness approximate
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