VS
Name
—
Ca(SO₄)
Formula
—
Mineral Species
Entry type
—
Sulfates
Chemical class
—
Orthorhombic
Crystal system
—
3–3.5
Mohs hardness
—
2.98
Specific gravity
—
White to pale gray
Streak
—
Pearly on {010}, vitreous to greasy on {001}; vitreous on {100}
Luster
—
On {010}, perfect; on {100} nearly perfect; on {001} good to imperfect, yielding pseudocubic fragments
Cleavage
—
C222
Space group
—
—
Structural group
—
Anh · Grandfathered
IMA
—
1794
Named in
—
White, Gray, Blue, Colorless, Pink
Typical colors
—
Ca · S · O
Elements
—