Color
-
Brown, Brownish, Yellow, Black, Reddish
Specific Gravity
-9999
3.7-3.8
Fracture
-
Subconchoidal, Conchoidal
Cleavage
-
Distinct on {010}
Mohs Hardness
-9999
7-7.5
Chemical Composition
Sb2O3
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
Pleochroism
-
X = colorless; Y = pale yellow; Z = golden yellow
Refractive Index
2.087
1.736-1.762
Crystal System
cubic (α)<570 °C
monoclinic
Birefringence
-9999
0.009-0.015
Neurological
-
Enhances mental clarity and focus
Healing
-
Physical healing
Qualities Associated
Protection
Protection