Lapis lazuli Vs Covellite
Origin
Afghanistan
Mexico
Color
Violet, Blue, White
Blue, Blue, Black
Streak
Blue
Grey, Black, gray
For which Rashi?
Sagittarius
Not Available
Planet
Venus
Not Available
Element of Planets
Water
Not Available
Finger
Not Available
Not Available
Ring Metal
Not Available
Not Available
Energy
Receptive
Not Available
Deities
Venus
Not Available
Not to wear with
Not Available
Not Available
Powers
Protection, Courage
Not Available
Planetary
Not Available
Not Available
Talisman
Not Available
Not Available
Tenacity
Not Available
Flexible
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.50-3.00
4.6-4.76
Fracture
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Metallic
Cleavage
3,6
Perfect on {0001}
Mohs Hardness
5.5
Not Available
Chemical Composition
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4
CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
Luster
Vitreous, Greasy
Resinous
Pleochroism
AbsentWalter Schumann
Marked
Dispersion
None
Not Available
Transparency
Opaque
OpaqueAnthony et al, Handbook of mineralogy (2001) More from other references
Refractive Index
1.500-1.670
1.45-2.62
Optic Character
Not Available
Not Available
Crystal System
Trigonal
Hexagonal
Birefringence
Not Available
Not Available
Clarity
Gemstones of the world (2001)
OpaqueAnthony et al
Neurological
Not Available
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Cardiovascular
Not Available
Not Available
Respiratory
Not Available
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Reproductive
Not Available
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Digestive
Not Available
Not Available
Psychology
Not Available
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Healing
Not Available
Not Available
Qualities Associated
Not Available
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Lapis lazuli Vs Covellite Fracture
Fracture is an important parameter when you compare Lapis lazuli and Covellite Physical Properties. It is necessary to understand the significance of these properties, before you compare Lapis lazuli Vs Covellite 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 Lapis lazuli is ConchoidalWalter Schumann, Gemstones of the world (2001) and Uneven-Conchoidal. Covellite fracture is Brittle, Gemstones (2009), Gemstones (2009), Metallic and UnevenArthur Thomas.
Lapis lazuli Vs Covellite Luster
A primary knowledge about Lapis lazuli vs Covellite 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. Lapis lazuli exhibits Greasy and Vitreous luster. Covellite, on other hand, exhibits Resinous luster.