Formula: Ca3B2O6
Origin of name: for Prof. Hiroshi Takeda (1934- ) , of the Mineralogial Institute, University of Tokyo.
Crystal system: Hexagonal
Crystal class: 3 2/m
Twinning:
Unit cell: a = 8.638, c = 11.85
Colour: White to pale gray, colourless
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Grains to 0.3 by 0.8 mm forming aggregates
Hardness: 4.5
Specific gravity: 3.10
Cleavage: 1, {110} imperfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments: easily soluble in dilute HCl
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