Nepheline Vs Alexandrite
Origin
Canada
Russia, Brazil, Tanzania, Madagascar, Zambia, Sri Lanka, Burma, India, Color: color change, from bluish green (daylight) to purple, red or brown (incandescent light), Hardness: 8, Refractive index: 1.74 1.77, Density: 3.68 3.80, Chemical composition: BeAl2O4, Crystal structure: orthorhombic, Origins: Russia, Brazil, Tanzania, Madagascar, Zambia, Sri Lanka, Burma
Color
White, Reddish, gray, Brown, Brownish
Green
Streak
White
Not Available
For which Rashi?
Not Available
Scorpio
Planet
Not Available
Venus
Element of Planets
Not Available
Earth
Finger
Not Available
Not Available
Ring Metal
Not Available
Not Available
Energy
Not Available
Projective, Receptive
Deities
Not Available
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Not to wear with
Not Available
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Powers
Not Available
Love
Planetary
Not Available
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Talisman
Not Available
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Tenacity
Not Available
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Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.55-2.65
3.69-3.81
Fracture
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Not Available
Cleavage
[1010] Poor
1,1 ; 3,2.
Chemical Composition
Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
BeAl 2 O 4
Luster
Vitreous, Greasy
Vitreous
Pleochroism
Not Available
Not Available
Dispersion
Not Available
Not Available
Transparency
Transparent, Translucent
Transparent, Transparent to nearly opaque
Refractive Index
1.529-1.547
1.739-1.770
Optic Character
Not Available
Biaxial/+
Crystal System
Hexagonal
Orthorhombic
Birefringence
0.003-0.004
0.007-0.010
Clarity
Transparent
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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Nepheline Vs Alexandrite Fracture
Fracture is an important parameter when you compare Nepheline and Alexandrite Physical Properties. It is necessary to understand the significance of these properties, before you compare Nepheline Vs Alexandrite 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.
Nepheline Vs Alexandrite Luster
A primary knowledge about Nepheline vs Alexandrite 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. Alexandrite, on other hand, exhibits Vitreous luster.