Origin
-
Southern and central Africa
Color
Brown
Brown, White, Greenish, gray, Green, Brownish
Specific Gravity
3.314
2.9-3.5
Fracture
Uneven
Conchoidal
Cleavage
1 perfect
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
6.5-7
5.5-6
Chemical Composition
Ca2Mn2+Al2BSi5O17(OH)
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Luster
-
Vitreous, Pearly
Transparency
Transparent
Transparent
Refractive Index
1.678-1.692
1.603-1.690
Optic Character
-
Biaxial/+
Crystal System
-
Orthorhombic Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Birefringence
-9999
-9999
Neurological
-
Enhances brain function
Cardiovascular
-
Supports heart health
Digestive
Supports digestive health
-
Psychology
Creativity
Peace
Healing
Emotional healing
Emotional healing
Qualities Associated
Creativity
Self-discovery