VS
Name
—
(Mn²⁺₂Al)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Hexagonal
Crystal system
—
7
Mohs hardness
—
3.13
Specific gravity
—
White
Streak
—
Vitreous
Luster
—
None
Cleavage
—
R3m
Space group
—
Tourmaline
Structural group
—
Cll · Approved
IMA
—
2020
Named in
—
Violet to gray-blue, dark brownish green
Typical colors
—
Mn · Al · Si · O · B · H
Elements
—