VS
Name
—
(Mg,Al)₆.₅(BO₃)₃(OH)₄( ,Cl)₀.₅
Formula
—
Mineral Species
Entry type
—
Borates
Chemical class
—
Orthorhombic
Crystal system
—
5.5
Mohs hardness
—
2.8–2.85
Specific gravity
—
White
Streak
—
Silky
Luster
—
Perfect on {001}
Cleavage
—
P2_12_12
Space group
—
—
Structural group
—
Ka · Approved
IMA
—
1980
Named in
—
White, pale green, may have a brown oxidization crust; colorless in transmitted light
Typical colors
—
Mg · Al · B · O · H · Cl
Elements
—