VS
Name
—
KFe³⁺(SO₄)₂·H₂O
Formula
—
Mineral Species
Entry type
—
Sulfates
Chemical class
—
Monoclinic
Crystal system
—
2.5
Mohs hardness
—
2.84
Specific gravity
—
White
Streak
—
Vitreous to dull
Luster
—
On {001}, perfect; on {100}, good
Cleavage
—
P2_1/m
Space group
—
—
Structural group
—
Ksi · Grandfathered
IMA
—
1931
Named in
—
Pale lemon-yellow, yellowish green, gray; pale yellow to colorless in transmitted light
Typical colors
—
K · Fe · S · O · H
Elements
—