Color
Brown, Green, Brownish, Yellow, Greenish, White, Black
Colorless, White, Red, gray, pink
Specific Gravity
2.9
2.78
Fracture
Fibrous
Conchoidal
Cleavage
[010] Perfect, [100] Distinct, [011] Distinct
Perfect on {10 1 }; parting on {010}
Chemical Composition
Amethyst, Clear Quartz, Smoky Quartz, Cacoxenite, Rutile, Geothite, Lepidocrocite
K2Ca2Mg(SO4)4·2H2O
Luster
Vitreous, Pearly, Silky
Vitreous, Resinous
Transparency
Transparent, Translucent, Opaque
-
Refractive Index
1.519-1.521
1.546-1.548
Crystal System
monoclinic
Triclinic
Birefringence
0.0090-0.0100
0.021
Neurological
Aids in mental clarity and focus
-
Respiratory
Excellent
Good
Healing
Spiritual healing
Physical healing
Qualities Associated
Harmony
Emotional Healing