Origin
Southern and central Africa
Australia, Spain, Brazil, Germany
Color
Brown, White, Greenish, gray, Green, Brownish
Green, Blue, Colorless
Element of Planets
-
Earth
Specific Gravity
2.9-3.5
2.42-2.58
Fracture
Conchoidal
Conchoidal, Splintery, ConchoidalWalter Schumann
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
[010] perfect
Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
AlPO4 · 2(H2O)
Luster
Vitreous, Pearly
Vitreous, Waxy
Transparency
Transparent
Translucent, Opaque . May be translucent when backlit on the edges.
Refractive Index
1.603-1.690
1.560-1.594
Optic Character
Biaxial/+
-
Crystal System
Orthorhombic Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Orthorhombic
Birefringence
-9999
0.031
Clarity
Transparent
Translucent
Neurological
Enhances brain function
-
Cardiovascular
Supports heart health
Supports heart health
Healing
Emotional healing
Emotional healing
Qualities Associated
Self-discovery
Harmony