Fayalite Vs Sillimanite
Origin
Southern and central Africa
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Color
Yellow, Brown, Black, Black
Blue, Green, Brownish, Greenish, Colorless, 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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Tenacity
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Tough
Solubility
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Durability
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Specific Gravity
4.392
3.20-3.26
Fracture
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Splintery
Cleavage
{010} moderate, {100} imperfect
{010} perfect
Mohs Hardness
6.5-7
6-7.5
Chemical Composition
Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Luster
Vitreous, Resinous
Vitreous, Subadamantine, Silky
Pleochroism
Faint
Colourless to pale brown to yellow
Dispersion
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Transparency
TransparentAnthony et al, Handbook of mineralogy (2001)
Transparent, Translucent
Refractive Index
1.827-1.879
1.653-1.685
Optic Character
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Crystal System
Orthorhombic
Orthorhombic
Birefringence
0.042-0.051
0.020-0.022
Clarity
TransparentAnthony et al
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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Fayalite Vs Sillimanite Fracture
Fracture is an important parameter when you compare Fayalite and Sillimanite Physical Properties. It is necessary to understand the significance of these properties, before you compare Fayalite Vs Sillimanite 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 Fayalite is Brittle, Conchoidal, Conchoidal, ConchoidalAnthony et al and Handbook of mineralogy (2001). Sillimanite fracture is Splintery.
Fayalite Vs Sillimanite Luster
A primary knowledge about Fayalite vs Sillimanite 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. Fayalite exhibits Resinous and Vitreous luster. Sillimanite, on other hand, exhibits Silky, Subadamantine and Vitreous luster.