Origin
Spain, Brazil, USA, Sri Lanka, Burma, Color: strongly pleochroic, reddish brown, pink / yellowish green, Hardness: 7 7.5, Refractive index: 1.63 1.65, Density: 3.13 3.21, Chemical composition: Al2SiO5, Crystal structure: orthorhombic, Lustre: vitreous, greasy, Origins: Spain, Burma. Discovered in Andalusia (Spain), the andalusite stone is relatively rare, with big crystals over 10 ct. especially rare. Due to its remarkable pleochroism effect, the stone is highly valued by collectors., brown
Canada, USA, Brazil, Italy, Mozambique, Zimbabwe, Russia, Burma, Australia
Color
Brown, pink, Violet, Yellow, Green, White, gray, Colorless, Red
Colorless, gray, Yellow, White
For which Rashi?
All
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Planet
Venus
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Element of Planets
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Energy
Projective, Receptive
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Finger
Not Available
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Ring Metal
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Deities
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Not to wear with
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Powers
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Planetary
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Talisman
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Tenacity
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Brittle
Solubility
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insoluble
Durability
Not Available
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Specific Gravity
3.05-3.21
2.40
Fracture
Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
Cleavage
Good on {110}, poor on {100}
Perfect on {001}, poor on {201} with 38.5° angle between the two
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Luster
Vitreous, Greasy
Vitreous, Pearly
Pleochroism
strongly trichroic
AbsentWalter Schumann
Transparency
Transparent, Translucent
Gemmological Tables (2004) More from other references
Refractive Index
1.627-1.650
1.502-1.523
Optic Character
Not Available
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Crystal System
Orthorhombic
monoclinic
Birefringence
0.009-0.010
0.012-0.016
Clarity
Transparent
TransparentUlrich Henn and Claudio C. Milisenda
Neurological
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Cardiovascular
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Respiratory
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Reproductive
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Digestive
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Psychology
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Healing
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Qualities Associated
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Andalusite Vs Petalite Fracture
Fracture is an important parameter when you compare Andalusite and Petalite Physical Properties. It is necessary to understand the significance of these properties, before you compare Andalusite Vs Petalite fracture. Whenever a gemstone chip breaks, it leaves a characteristic line along its breakage. Such lines are known as fracture and are used to identify the gemstones in their initial stages of production when they are in the form of rough minerals. Fracture is usually described with the terms “fibrous” and “splintery” to denote a fracture that usually leaves elongated and sharp edges. Fracture observed in Andalusite is Uneven, Subconchoidal, Splintery, UnevenArthur Thomas and Gemstones (2009). Petalite fracture is Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle and Conchoidal.
Andalusite Vs Petalite Luster
A primary knowledge about Andalusite vs Petalite luster is useful in apparent identifications of these gemstones. Luster is the measure of light that gets reflected when incident on a finished cut gemstone. There are two major types of lusters: Silky and Adamantine. Since luster varies between two crystals of even the same gemstone, luster is limited to basic identification criteria. Andalusite exhibits Vitreous and Greasy luster. Petalite, on other hand, exhibits Vitreous and Pearly luster.
