Color
White, Colorless, Blue, Red, Green, Yellow, Violet
Colorless, White, Greenish, Brown
Specific Gravity
-9999
2.20-2.40
Fracture
-
Conchoidal, Splintery, Fibrous
Cleavage
None
Perfect on {010}, distinct on {100}
Chemical Composition
C
CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
Luster
-
Vitreous, Silky, Pearly, Waxy
Transparency
-
Transparent, Translucent
Refractive Index
-9999
1.521-1.531
Crystal System
-
monoclinic
Birefringence
-9999
0.010
Psychology
Strength
Harmony
Healing
-
Emotional healing
Qualities Associated
Strength
Harmony