Origin
Southern and central Africa
Mexico, USA, Spain
Color
White, Colorless, gray, Yellow
Green, Brown, Yellow, Red, Black
Streak
White
Brownish, White
Specific Gravity
2.45-2.50
3.95-4.10
Fracture
Conchoidal
Uneven
Cleavage
Poor on {110}
{110} Perfect, {110} Perfect, {110} Perfect
Mohs Hardness
5.5-6
3.5-4
Chemical Composition
KAlSi 2O 6Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Luster
Vitreous
Adamantine
Transparency
-
Transparent, Translucent
Refractive Index
1.504-1.510
2.368-2.371
Crystal System
tetragonal
Isometric
Birefringence
0.001
-9999
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent
Healing
Emotional healing
Physical healing
Qualities Associated
Balance
-