Origin
Color
Streak
For which Rashi?
Planet
Element of Planets
Energy
Finger
Ring Metal
Deities
Not to wear with
Powers
Planetary
Talisman
Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
Luster
Pleochroism
Dispersion
Transparency
Refractive Index
Optic Character
Crystal System
Birefringence
Clarity
Neurological
Cardiovascular
Respiratory
Reproductive
Digestive
Psychology
Healing
Qualities Associated
Southern and central Africa
Blue, Violet, Brown, White, Greenish, pink
Fibrous, ConchoidalWalter Schumann
Distinct on {100}, poor on {110}; parting on {001}
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue
Translucent, Translucent to opaque
Enhances mental clarity and focus
Kenya, Southern and central Africa
Green, Brown, Yellow, Red
Al 2SiO 5Arthur Thomas , Gemstones (2009) More from other references
Blue stones strong trichroism: colorless/pale blue (greenish or violet)-blue dark blueHerve Nicolas Lazzarelli