Formula: Ba4(V,Ti)4Si8B2O27Cl(O,OH)2
Origin of name: for Otokichi Nagashima, Japanese amateur mineralogist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: greenish black
Diaphaneity:
Luster: vitreous to submetallic
Habit: crystals tabular, elongated along b-axis, subparallel aggregates
Hardness: 6
Specific gravity: 4.08
Cleavage: none
Tenacity:
Streak: green
Synonyms/varieties:
Comments:
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