Sellaite Vs Alexandrite
Origin
Brazil
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
Colorless, White
Green
Streak
White
Not Available
For which Rashi?
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Scorpio
Planet
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Venus
Element of Planets
Not Available
Earth
Finger
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Ring Metal
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Energy
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Projective, Receptive
Deities
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Not to wear with
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Powers
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Love
Planetary
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Talisman
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Tenacity
Brittle
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Solubility
Not Available
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Durability
Not Available
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Specific Gravity
3.14-3.16
3.69-3.81
Fracture
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle
Not Available
Cleavage
Perfect on {010} and {110}
1,1 ; 3,2.
Chemical Composition
MgF 2Ulrich Henn and Claudio C.
BeAl 2 O 4
Pleochroism
Not Available
Not Available
Dispersion
Not Available
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Transparency
Transparent
Transparent, Transparent to nearly opaque
Refractive Index
1.378-1.390
1.739-1.770
Optic Character
Not Available
Biaxial/+
Crystal System
tetragonal
Orthorhombic
Birefringence
0.012
0.007-0.010
Clarity
Transparent
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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Sellaite Vs Alexandrite Fracture
Fracture is an important parameter when you compare Sellaite and Alexandrite Physical Properties. It is necessary to understand the significance of these properties, before you compare Sellaite 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 Sellaite is Brittle, Conchoidal, ConchoidalAnthony et al and Handbook of mineralogy (2001).
Sellaite Vs Alexandrite Luster
A primary knowledge about Sellaite 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. Sellaite exhibits Vitreous luster. Alexandrite, on other hand, exhibits Vitreous luster.