Origin
Southern and central Africa
-
Color
Brown, White, Greenish, gray, Green, Brownish
Brown, Blue, Green, Yellow, White
Specific Gravity
2.9-3.5
3.32-3.43
Fracture
Conchoidal
Conchoidal
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Poor on {110} and {100} very poor on {001}
Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4
Luster
Vitreous, Pearly
Vitreous, Resinous
Pleochroism
-
slight in colored varieties
Transparency
Transparent
-
Refractive Index
1.603-1.690
1.703-1.752
Optic Character
Biaxial/+
-
Crystal System
Orthorhombic Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
tetragonal
Birefringence
-9999
0.004-0.006
Neurological
Enhances brain function
Enhances mental clarity and focus
Cardiovascular
Supports heart health
Supports heart health
Psychology
Peace
Transformation
Healing
Emotional healing
Emotional healing
Qualities Associated
Self-discovery
Transformation