Origin
-
Tanzania, Madagascar, Kenya, Sri Lanka, Burma, Australia
Color
Reddish, Brown, Yellow, Green, Red, Greenish, gray
Green, Brown, Colorless, Greenish, Yellow
Specific Gravity
2
3.25-3.45
Fracture
Conchoidal, Uneven
Conchoidal, Uneven
Cleavage
Imperfect on {001}, indistinct on {011}
Good on {110}
Chemical Composition
PbWO4
Mg 3Al 6(Si,Al,B) 5O 21(OH)Walter Schumann , Gemstones of the world (2001) More from other references
Luster
Resinous, Subadamantine
Vitreous
Pleochroism
-
X = colorless to green; Y = colorless
Refractive Index
2.180-2.190
1.660-1.685
Crystal System
tetragonal
Orthorhombic
Birefringence
0.090
0.012-0.017
Clarity
-
TransparentUlrich Henn and Claudio C. Milisenda
Psychology
Confidence
Harmony
Healing
Physical healing
Emotional healing
Qualities Associated
Vitality
Self-worth