Nepheline Vs Grandidierite
Color
White, Reddish, gray, Brown, Brownish
Green
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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Solubility
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Durability
Not Available
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Specific Gravity
2.55-2.65
2.85-3.00
Fracture
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Brittle, UnevenArthur Thomas, Gemstones (2009), Brittle, Uneven
Cleavage
[1010] Poor
Perfect
Chemical Composition
Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
(Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.
Luster
Vitreous, Greasy
Vitreous, Pearly
Pleochroism
Not Available
visible
Dispersion
Not Available
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Transparency
Transparent, Translucent
Gemmological Tables (2004) More from other references
Refractive Index
1.529-1.547
1.578-1.639
Optic Character
Not Available
Not Available
Crystal System
Hexagonal
Orthorhombic
Birefringence
0.003-0.004
0.037-0.039
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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Nepheline Vs Grandidierite Fracture
Fracture is an important parameter when you compare Nepheline and Grandidierite Physical Properties. It is necessary to understand the significance of these properties, before you compare Nepheline Vs Grandidierite 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 Nepheline is Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009) and Subconchoidal. Grandidierite fracture is Brittle, Brittle, Gemstones (2009), Uneven and UnevenArthur Thomas.
Nepheline Vs Grandidierite Luster
A primary knowledge about Nepheline vs Grandidierite 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. Nepheline exhibits Greasy and Vitreous luster. Grandidierite, on other hand, exhibits Pearly and Vitreous luster.