Sillimanite Vs Gahnite
Origin
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Australia
Color
Blue, Green, Brownish, Greenish, Colorless, gray
Blue, Green, Greenish, Black
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
4.00-4.62
Fracture
Splintery
Conchoidal, Uneven
Cleavage
{010} perfect
Indistinct parting on [111]
Mohs Hardness
6-7.5
7.5-8
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Luster
Vitreous, Subadamantine, Silky
Vitreous
Pleochroism
Colourless to pale brown to yellow
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Dispersion
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Transparency
Transparent, Translucent
Gemmological Tables (2004) More from other references
Refractive Index
1.653-1.685
1.790-1.818
Optic Character
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Crystal System
Orthorhombic
cubic
Birefringence
0.020-0.022
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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 Gahnite Fracture
Fracture is an important parameter when you compare Sillimanite and Gahnite Physical Properties. It is necessary to understand the significance of these properties, before you compare Sillimanite Vs Gahnite 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. Gahnite fracture is Conchoidal and Uneven.
Sillimanite Vs Gahnite Luster
A primary knowledge about Sillimanite vs Gahnite 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. Gahnite, on other hand, exhibits Vitreous luster.