Origin
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Afghanistan, Brazil, Madagascar, Mozambique, Southern and central Africa, Russia, Sri Lanka
Color
Blue, Green, Brownish, Greenish, Colorless, gray
White, Colorless, Blue, Red, Green, Yellow, Violet
Specific Gravity
3.20-3.26
3.01-3.06
Fracture
Splintery
Conchoidal
Cleavage
{010} perfect
Indiscernible
Mohs Hardness
6-7.5
7-7.5
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.
Luster
Vitreous, Subadamantine, Silky
-
Pleochroism
Colourless to pale brown to yellow
Strong: dark red pinkish-redHerve Nicolas Lazzarelli
Transparency
Transparent, Translucent
Transparent, Translucent
Refractive Index
1.653-1.685
1.614-1.666
Crystal System
Orthorhombic
-
Birefringence
0.020-0.022
0.014-0.040
Clarity
Transparent
Transparent
Respiratory
Good
Excellent
Psychology
Creativity
Passion
Healing
Emotional healing
Emotional healing
Qualities Associated
Creativity
Passion
Sillimanite Vs Rubellite Fracture
Fracture is an important parameter when you compare Sillimanite and Rubellite Physical Properties. It is necessary to understand the significance of these properties, before you compare Sillimanite Vs Rubellite 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. Rubellite fracture is Conchoidal.
Sillimanite Vs Rubellite Luster
A primary knowledge about Sillimanite vs Rubellite 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 Vitreous, Subadamantine and Silky luster.