Grandidierite Vs Dravite
Origin
Madagascar
Southern and central Africa
Color
Green
White, Colorless, Blue, Red, Green, Yellow, Violet, Black, Green, Red, Blue, White
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
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Specific Gravity
2.85-3.00
3.03-3.18
Fracture
Brittle, UnevenArthur Thomas, Gemstones (2009), Brittle, Uneven
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Cleavage
Perfect
{???} Indistinct
Chemical Composition
(Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Luster
Vitreous, Pearly
Vitreous
Pleochroism
visible
Very strong: pale yellow colorless
Transparency
Gemmological Tables (2004) More from other references
Transparent
Refractive Index
1.578-1.639
1.614-1.666
Optic Character
Not Available
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Crystal System
Orthorhombic
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Birefringence
0.037-0.039
0.014-0.032
Clarity
Gemmological Tables (2004) More from other references
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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Grandidierite Vs Dravite Fracture
Fracture is an important parameter when you compare Grandidierite and Dravite Physical Properties. It is necessary to understand the significance of these properties, before you compare Grandidierite Vs Dravite 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 Grandidierite is Brittle, Brittle, Gemstones (2009), Uneven and UnevenArthur Thomas. Dravite fracture is Brittle, Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Irregular, Uneven and Uneven.
Grandidierite Vs Dravite Luster
A primary knowledge about Grandidierite vs Dravite 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. Grandidierite exhibits Pearly and Vitreous luster. Dravite, on other hand, exhibits Vitreous luster.