Sillimanite Vs Grandidierite
Origin
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Madagascar
Color
Blue, Green, Brownish, Greenish, Colorless, gray
Green
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
2.85-3.00
Fracture
Splintery
Brittle, UnevenArthur Thomas, Gemstones (2009), Brittle, Uneven
Cleavage
{010} perfect
Perfect
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
(Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.
Luster
Vitreous, Subadamantine, Silky
Vitreous, Pearly
Pleochroism
Colourless to pale brown to yellow
visible
Dispersion
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Transparency
Transparent, Translucent
Gemmological Tables (2004) More from other references
Refractive Index
1.653-1.685
1.578-1.639
Optic Character
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Crystal System
Orthorhombic
Orthorhombic
Birefringence
0.020-0.022
0.037-0.039
Clarity
Transparent
Gemmological Tables (2004) More from other references
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 Grandidierite Fracture
Fracture is an important parameter when you compare Sillimanite and Grandidierite Physical Properties. It is necessary to understand the significance of these properties, before you compare Sillimanite Vs Grandidierite 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. Grandidierite fracture is Brittle, Brittle, Gemstones (2009), Uneven and UnevenArthur Thomas.
Sillimanite Vs Grandidierite Luster
A primary knowledge about Sillimanite vs Grandidierite 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. Grandidierite, on other hand, exhibits Pearly and Vitreous luster.