Origin
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Southern and central Africa
Color
Blue, Green, Brownish, Greenish, Colorless, gray
Green, Grey, White
Specific Gravity
3.20-3.26
2.60-3.02
Fracture
Splintery
Uneven
Cleavage
{010} perfect
{001} Perfect
Mohs Hardness
6-7.5
2-2.5
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)
Luster
Vitreous, Subadamantine, Silky
Pearly, Greasy
Pleochroism
Colourless to pale brown to yellow
Distinct: light yellow-green to light bluE
Transparency
Transparent, Translucent
Transparent
Refractive Index
1.653-1.685
1.571-1.597
Optic Character
-
Biaxial/+
Crystal System
Orthorhombic
Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/m
Birefringence
0.020-0.022
-9999
Clarity
Transparent
Transparent
Psychology
Creativity
Harmony
Healing
Emotional healing
Physical healing
Qualities Associated
Creativity
Emotional Healing