VS
Name
—
K₂Ca(SO₄)₂·H₂O
Formula
—
Mineral Species
Entry type
—
Sulfates
Chemical class
—
Monoclinic
Crystal system
—
2.5
Mohs hardness
—
2.58–2.6
Specific gravity
—
—
Streak
—
Vitreous
Luster
—
On {110} and {100}, perfect; on {010}, distinct
Cleavage
—
P2_1/m
Space group
—
Syngenite
Structural group
—
Sgn · Grandfathered
IMA
—
1872
Named in
—
Colorless, milky white, faintly yellow due to inclusions; colorless in transmitted light
Typical colors
—
K · Ca · S · O · H
Elements
—