Origin
Austria, Spain, Russia, Canada, Australia
China, Canada
Color
Colorless, Brownish, Yellow, Green, gray, White
Green, Yellow, Brown, White, gray, Black
Specific Gravity
3.7-3.9
2.90-3.10
Fracture
Conchoidal
Splintery, Granular
Cleavage
{001} perfect; {111} imperfect, may exhibit parting on , {011}
None
Mohs Hardness
5.5-6
6-6.5
Chemical Composition
MgOMichael OâDonoghue , Gems, Sixth Edition (2006)
Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
Luster
Vitreous
Vitreous, Greasy
Transparency
TransparentWalter Schumann
Translucent
Refractive Index
1.735-1.738
1.600-1.627
Crystal System
Isometric
monoclinic
Birefringence
-9999
0.027
Clarity
TransparentWalter Schumann
Translucent
Neurological
-
Aids in mental clarity and focus
Psychology
-
Emotional Balance
Healing
-
Physical healing
Qualities Associated
-
Healing