Covellite Vs Sillimanite
Origin
Mexico
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Color
Blue, Blue, Black
Blue, Green, Brownish, Greenish, Colorless, gray
Streak
Grey, Black, gray
White
For which Rashi?
Not Available
Not Available
Planet
Not Available
Not Available
Element of Planets
Not Available
Not Available
Finger
Not Available
Not Available
Ring Metal
Not Available
Not Available
Energy
Not Available
Not Available
Deities
Not Available
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Not to wear with
Not Available
Not Available
Powers
Not Available
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Planetary
Not Available
Not Available
Talisman
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
4.6-4.76
3.20-3.26
Fracture
Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Metallic
Splintery
Cleavage
Perfect on {0001}
{010} perfect
Mohs Hardness
Not Available
6-7.5
Chemical Composition
CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Luster
Resinous
Vitreous, Subadamantine, Silky
Pleochroism
Marked
Colourless to pale brown to yellow
Dispersion
Not Available
Not Available
Transparency
OpaqueAnthony et al, Handbook of mineralogy (2001) More from other references
Transparent, Translucent
Refractive Index
1.45-2.62
1.653-1.685
Optic Character
Not Available
Not Available
Crystal System
Hexagonal
Orthorhombic
Birefringence
Not Available
0.020-0.022
Clarity
OpaqueAnthony et al
Transparent
Neurological
Not Available
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Cardiovascular
Not Available
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Respiratory
Not Available
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Reproductive
Not Available
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Digestive
Not Available
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Psychology
Not Available
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Healing
Not Available
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Qualities Associated
Not Available
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Covellite Vs Sillimanite Fracture
Fracture is an important parameter when you compare Covellite and Sillimanite Physical Properties. It is necessary to understand the significance of these properties, before you compare Covellite 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 Covellite is Brittle, Gemstones (2009), Gemstones (2009), Metallic and UnevenArthur Thomas. Sillimanite fracture is Splintery.
Covellite Vs Sillimanite Luster
A primary knowledge about Covellite 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. Covellite exhibits Resinous luster. Sillimanite, on other hand, exhibits Silky, Subadamantine and Vitreous luster.