Sillimanite Vs Poudretteite
Origin
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Canada, Southern and central Africa
Color
Blue, Green, Brownish, Greenish, Colorless, gray
Violet, Colorless, pink
For which Rashi?
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Planet
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Element of Planets
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Finger
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Ring Metal
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Energy
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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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Solubility
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Durability
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Specific Gravity
3.20-3.26
2.51-2.53
Fracture
Splintery
Conchoidal, Splintery
Cleavage
{010} perfect
None
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)
Luster
Vitreous, Subadamantine, Silky
Vitreous
Pleochroism
Colourless to pale brown to yellow
Colorless
Dispersion
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Transparency
Transparent, Translucent
Gemmological Tables (2004) More from other references
Refractive Index
1.653-1.685
1.511-1.532
Optic Character
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Crystal System
Orthorhombic
Hexagonal
Birefringence
0.020-0.022
0.021
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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Sillimanite Vs Poudretteite Fracture
Fracture is an important parameter when you compare Sillimanite and Poudretteite Physical Properties. It is necessary to understand the significance of these properties, before you compare Sillimanite Vs Poudretteite 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 Sillimanite is Splintery. Poudretteite fracture is Conchoidal and Splintery.
Sillimanite Vs Poudretteite Luster
A primary knowledge about Sillimanite vs Poudretteite 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. Sillimanite exhibits Silky, Subadamantine and Vitreous luster. Poudretteite, on other hand, exhibits Vitreous luster.