1 Astrology
1.1 Origin
Madagascar
Afghanistan, Southern and central Africa
1.2 Color
Brownish, Black, Reddish, Brown, Blue
Blue, Greenish, Violet
1.3 Streak
Reddish, Brown
Blue, White
1.4 For which Rashi?
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1.5 Planet
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1.6 Element of Planets
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1.7 How to Wear?
1.7.1 Finger
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1.7.2 Ring Metal
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1.8 Energy
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1.9 Deities
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1.10 Not to wear with
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1.11 Powers
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1.12 Birthstone
1.12.1 Planetary
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1.12.2 Talisman
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2 Physical Properties
2.1 Tenacity
2.2 Solubility
2.3 Durability
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2.4 Specific Gravity
2.5 Fracture
Subconchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
2.6 Cleavage
{0001} good, {10 1 0} parting
Imperfect on {110}
2.7 Mohs Hardness
2.8 Chemical Composition
(Ca,Ce)(Al,Ti,Mg)12O19
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
3 Optical Properties
3.1 Luster
3.2 Pleochroism
O = brownish gray; E = gray
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3.3 Dispersion
3.4 Transparency
Handbook of mineralogy (2001)
Gemmological Tables (2004) More from other references
3.5 Refractive Index
3.6 Optic Character
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3.7 Crystal System
3.8 Birefringence
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0
0.296
3.9 Clarity
Handbook of mineralogy (2001)
Gemmological Tables (2004) More from other references
4 Benefits
4.1 Physical
4.1.1 Neurological
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4.1.2 Cardiovascular
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4.1.3 Respiratory
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4.1.4 Reproductive
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4.1.5 Digestive
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4.2 Psychology
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4.3 Healing
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4.4 Qualities Associated
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