Origin
Italy, China
Austria, Brazil, Canada, India, Madagascar, Russia, Sri Lanka, USA
Color
Colorless, White, Blue, gray
Red, Brown, Brownish, Black
Specific Gravity
3.09
3.95-4.30
Fracture
Uneven
Conchoidal
Cleavage
Perfect on {100} and {010}, imperfect on {101}
none
Chemical Composition
CaAl2Si2O7(OH)2.H2O
Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Luster
Vitreous, Greasy
Greasy, Vitreous
Refractive Index
1.672-1.676
1.770-1.820
Crystal System
Orthorhombic
cubic
Birefringence
0.019-0.021
-9999
Clarity
-
TransparentUlrich Henn and Claudio C. Milisenda
Reproductive
-
Supports reproductive health
Healing
Emotional healing
Emotional healing
Qualities Associated
-
Devotion