Sillimanite Vs Corundum
Origin
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Southern and central Africa
Color
Blue, Green, Brownish, Greenish, Colorless, gray
Violet, Blue, Red, Yellow, Brown, gray
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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insoluble
Durability
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Specific Gravity
3.20-3.26
3.90-4.05
Fracture
Splintery
Uneven, Uneven, Gems, Difficult, Fibrous
Cleavage
{010} perfect
None – parting in 3 directions
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Al 2O 3Arthur Thomas , Gemstones (2009)
Luster
Vitreous, Subadamantine, Silky
Adamantine, Vitreous
Pleochroism
Colourless to pale brown to yellow
None
Transparency
Transparent, Translucent
Transparent, Translucent
Refractive Index
1.653-1.685
1.758-1.780
Optic Character
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Crystal System
Orthorhombic
Trigonal
Birefringence
0.020-0.022
0.007-0.010
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 Corundum Fracture
Fracture is an important parameter when you compare Sillimanite and Corundum Physical Properties. It is necessary to understand the significance of these properties, before you compare Sillimanite Vs Corundum 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. Corundum fracture is Difficult, Fibrous, Gems, Uneven and Uneven.
Sillimanite Vs Corundum Luster
A primary knowledge about Sillimanite vs Corundum 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. Corundum, on other hand, exhibits Adamantine and Vitreous luster.