Petalite Vs Blue John
Origin
Canada, USA, Brazil, Italy, Mozambique, Zimbabwe, Russia, Burma, Australia
Not Available
Color
Colorless, gray, Yellow, White
White, Colorless, Blue, Red, Green, Yellow, Violet
Streak
Colorless
Not Available
For which Rashi?
Not Available
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Planet
Not Available
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Element of Planets
Not Available
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Finger
Not Available
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Ring Metal
Not Available
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Energy
Not Available
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Deities
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Not to wear with
Not Available
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Powers
Not Available
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Planetary
Not Available
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Talisman
Not Available
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Tenacity
Brittle
Not Available
Solubility
insoluble
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.40
3.00-3.25
Fracture
Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
Not Available
Cleavage
Perfect on {001}, poor on {201} with 38.5° angle between the two
Not Available
Mohs Hardness
6-6.5
Not Available
Chemical Composition
LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Luster
Vitreous, Pearly
Not Available
Pleochroism
AbsentWalter Schumann
Not Available
Transparency
Gemmological Tables (2004) More from other references
Transparent
Refractive Index
1.502-1.523
1.432-1.436
Optic Character
Not Available
Not Available
Crystal System
monoclinic
Not Available
Birefringence
0.012-0.016
Not Available
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent
Neurological
Not Available
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Cardiovascular
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Respiratory
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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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Petalite Vs Blue John Fracture
Fracture is an important parameter when you compare Petalite and Blue John Physical Properties. It is necessary to understand the significance of these properties, before you compare Petalite Vs Blue John 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 Petalite is Brittle, Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references and Subconchoidal.
Petalite Vs Blue John Luster
A primary knowledge about Petalite vs Blue John 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. Petalite exhibits Pearly and Vitreous luster.