Origin
Southern and central Africa
Sri Lanka
Color
Yellow, Blue, Black, Green, gray
Green, Red, Blue, Brown, pink
Specific Gravity
3.43-3.44
3.02
Fracture
-
Uneven, Conchoidal
Cleavage
None Observed
{0001} Poor
Mohs Hardness
6.5-7
-9999
Chemical Composition
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca(Li 2Al)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Pleochroism
visible
Strong: dark brown light brownAnthony et al
Transparency
-
Transparent
Refractive Index
1.696-1.702
-9999
Crystal System
Triclinic
-
Birefringence
0.005
-9999
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent
Digestive
-
Supports digestive health
Healing
Emotional healing
Emotional healing
Qualities Associated
Transformation
Creativity