VS
Name
—
CaMg₃(Al₅Mg)(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Hexagonal
Crystal system
—
7.5
Mohs hardness
—
2.97–3.14
Specific gravity
—
White, light green, light brown
Streak
—
Vitreous to resinous
Luster
—
—
Cleavage
—
R3m
Space group
—
Tourmaline
Structural group
—
Uvt · Approved
IMA
—
2000
Named in
—
Brown, Green, Black, Red
Typical colors
—
Ca · Mg · Al · Si · O · B · H
Elements
—