1 Astrology
1.1 Origin
1.2 Color
Brownish, Black, Reddish, Brown, Blue
Yellow, yellowish orange
1.3 Streak
1.4 For which Rashi?
Not Available
Not Available
1.5 Planet
Not Available
Not Available
1.6 Element of Planets
Not Available
Not Available
1.7 How to Wear?
1.7.1 Finger
Not Available
Not Available
1.7.2 Ring Metal
Not Available
Not Available
1.8 Energy
Not Available
Not Available
1.9 Deities
Not Available
Not Available
1.10 Not to wear with
Not Available
Not Available
1.11 Powers
Not Available
Not Available
1.12 Birthstone
1.12.1 Planetary
Not Available
Not Available
1.12.2 Talisman
Not Available
Not Available
2 Physical Properties
2.1 Tenacity
2.2 Solubility
Not Available
Not Available
2.3 Durability
Not Available
Not Available
2.4 Specific Gravity
2.5 Fracture
Subconchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle
2.6 Cleavage
{0001} good, {10 1 0} parting
Imperfect, poor one {100}
2.7 Mohs Hardness
2.8 Chemical Composition
(Ca,Ce)(Al,Ti,Mg)12O19
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
3 Optical Properties
3.1 Luster
3.2 Pleochroism
O = brownish gray; E = gray
Colorless
3.3 Dispersion
3.4 Transparency
Handbook of mineralogy (2001)
Gems
3.5 Refractive Index
1.79-1.8071.702-1.740
1
3.25
3.6 Optic Character
Not Available
Not Available
3.7 Crystal System
3.8 Birefringence
Not Available0.060
0
0.296
3.9 Clarity
Handbook of mineralogy (2001)
Gems
4 Benefits
4.1 Physical
4.1.1 Neurological
Not Available
Not Available
4.1.2 Cardiovascular
Not Available
Not Available
4.1.3 Respiratory
Not Available
Not Available
4.1.4 Reproductive
Not Available
Not Available
4.1.5 Digestive
Not Available
Not Available
4.2 Psychology
Not Available
Not Available
4.3 Healing
Not Available
Not Available
4.4 Qualities Associated
Not Available
Not Available