Sillimanite Vs Poldervaartite
Origin
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Southern and central Africa
Color
Blue, Green, Brownish, Greenish, Colorless, gray
Colorless, White
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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Tenacity
Tough
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Solubility
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Durability
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Specific Gravity
3.20-3.26
2.91
Fracture
Splintery
Handbook of mineralogy (2001)
Cleavage
{010} perfect
None
Mohs Hardness
6-7.5
Not Available
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
(Ca,Mn2+ ) 2(SiO 3OH)(OH)Anthony et al , Handbook of Mineralogy (2001)
Luster
Vitreous, Subadamantine, Silky
Vitreous
Pleochroism
Colourless to pale brown to yellow
Weak: colorless light gray bluish grayAnthony et al
Dispersion
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Transparency
Transparent, Translucent
Transparent
Refractive Index
1.653-1.685
1.634-1.656
Optic Character
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Crystal System
Orthorhombic
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Birefringence
0.020-0.022
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Clarity
Transparent
Transparent
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 Poldervaartite Fracture
Fracture is an important parameter when you compare Sillimanite and Poldervaartite Physical Properties. It is necessary to understand the significance of these properties, before you compare Sillimanite Vs Poldervaartite 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. Poldervaartite fracture is Handbook of mineralogy (2001).
Sillimanite Vs Poldervaartite Luster
A primary knowledge about Sillimanite vs Poldervaartite 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. Poldervaartite, on other hand, exhibits Vitreous luster.