Origin
Southern and central Africa
Burma, Sri Lanka, India, Madagascar, Kenya, Tanzania, Thailand, Cambodia, China, Australia, USA
Color
Blue, Violet, Brown, White, Greenish, pink
Colorless, Yellow, Green, Violet, White, Blue, Red, pink
Streak
White
-
For which Rashi?
Leo, Sagittarius
Pisces, Taurus, Gemini, Libra
Planet
Saturn
Saturn
Element of Planets
Water
Water
Energy
-
-
How to Wear?
Finger
-
-
Ring Metal
-
-
Deities
Isis
Apollo
Not to wear with
-
-
Powers
Healing
Psychic Power
Birthstone
Planetary
-
-
Talisman
-
-
Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.26-3.413.95-4.03
1
7.18
👆🏻
Fracture
Fibrous, ConchoidalWalter Schumann
Uneven
Cleavage
Distinct on {100}, poor on {110}; parting on {001}
None, but may exhibit parting
Mohs Hardness
7-8.59
2
10
👆🏻
Chemical Composition
AlAl6O3BSi3O18
Al 2 O 3
Luster
Vitreous
Vitreous, Adamantine
Pleochroism
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue
Strong
Dispersion
0.010.02
0.005
1
👆🏻
Transparency
Translucent, Translucent to opaque
Transparent, Translucent, Transparent to opaque
Refractive Index
1.669-1.7231.762-1.788
1
3.25
👆🏻
Optic Character
-
-
Crystal System
Orthorhombic
Trigonal
Birefringence
0.011-0.0370.008-0.009
0
0.296
👆🏻
Clarity
Translucent
Transparent