VS
Name
—
Mg₃[B(OH)₄]₂(SO₄)(OH,F)₂
Formula
—
Mineral Species
Entry type
—
Sulfates
Chemical class
—
Orthorhombic
Crystal system
—
4–4.5
Mohs hardness
—
2.38–2.45
Specific gravity
—
—
Streak
—
—
Luster
—
{110}, good; {001}, fair
Cleavage
—
Pnma
Space group
—
—
Structural group
—
Sbo · Grandfathered
IMA
—
1893
Named in
—
Colorless, may be pale red from included iron oxide; colorless in transmitted light
Typical colors
—
Mg · B · O · H · S · F
Elements
—