Origin
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Australia, Southern and central Africa, green, brown, Australia, France, green, brown, Australia, France
Color
Blue, Green, Brownish, Greenish, Colorless, gray
Green, Colorless, gray, Yellow, White
For which Rashi?
Not Available
Libra
Planet
Not Available
Venus
Element of Planets
Not Available
Earth
Finger
Not Available
Not Available
Ring Metal
Not Available
Not Available
Energy
Not Available
Receptive
Deities
Not Available
Freya
Not to wear with
Not Available
Not Available
Powers
Not Available
Not Available
Planetary
Not Available
Not Available
Talisman
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.20-3.26
2.80-2.95
Fracture
Splintery
Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic
Cleavage
{010} perfect
Distinct on [001]
Mohs Hardness
6-7.5
6-6.5
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Ca2Al2Si3O12(OH)
Luster
Vitreous, Subadamantine, Silky
Vitreous
Pleochroism
Colourless to pale brown to yellow
AbsentWalter Schumann
Dispersion
Not Available
None
Transparency
Transparent, Translucent
Translucent
Refractive Index
1.653-1.685
1.611-1.673
Optic Character
Not Available
Not Available
Crystal System
Orthorhombic
Orthorhombic
Birefringence
0.020-0.022
0.021-0.033
Clarity
Transparent
TranslucentHerve Nicolas Lazzarelli
Neurological
Not Available
Not Available
Cardiovascular
Not Available
Not Available
Respiratory
Not Available
Not Available
Reproductive
Not Available
Not Available
Digestive
Not Available
Not Available
Psychology
Not Available
Not Available
Healing
Not Available
Not Available
Qualities Associated
Not Available
Not Available
Sillimanite Vs Prehnite Fracture
Fracture is an important parameter when you compare Sillimanite and Prehnite Physical Properties. It is necessary to understand the significance of these properties, before you compare Sillimanite Vs Prehnite 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 Sillimanite is Splintery. Prehnite fracture is Brittle, Gemstones of the world (2001) More from other references, Metallic, Uneven, UnevenWalter Schumann, White and Yellow.
Sillimanite Vs Prehnite Luster
A primary knowledge about Sillimanite vs Prehnite 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. Sillimanite exhibits Silky, Subadamantine and Vitreous luster. Prehnite, on other hand, exhibits Vitreous luster.