Origin
Austria, Brazil, Canada, India, Madagascar, Russia, Sri Lanka, USA
Southern and central Africa
Color
Red, Brown, Brownish, Black
Yellow, Blue, Colorless, White
Specific Gravity
3.95-4.30
3.28-3.31
Fracture
Conchoidal
Conchoidal
Cleavage
none
None observed
Mohs Hardness
7-7.5
6.5-7.5
Chemical Composition
Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Al 6B 5O 15(F,OH) 3Ulrich Henn and Claudio C.
Luster
Greasy, Vitreous
Vitreous
Pleochroism
None
Colorless
Refractive Index
1.770-1.820
1.638-1.650
Crystal System
cubic
Hexagonal
Birefringence
-9999
0.0130
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
TransparentUlrich Henn and Claudio C. Milisenda
Respiratory
Good
Excellent
Reproductive
Supports reproductive health
-
Psychology
Strength
Clarity
Healing
Emotional healing
Emotional healing
Qualities Associated
Devotion
Clarity