Origin
Brazil, USA, Canada, Madagascar, Sri Lanka, India, Burma
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Color
Blue, Violet, Yellow, Grey
Blue, Green, Brownish, Greenish, Colorless, gray
Streak
Not Available
White
For which Rashi?
Libra, Sagittarius, Taurus
Not Available
Planet
Jupiter
Not Available
Element of Planets
Water
Not Available
Energy
Receptive
Not Available
Finger
Not Available
Not Available
Ring Metal
Not Available
Not Available
Deities
Goddess
Not Available
Not to wear with
Not Available
Not Available
Powers
Not Available
Not Available
Planetary
Not Available
Not Available
Talisman
Not Available
Not Available
Tenacity
Not Available
Tough
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.6-2.7
3.20-3.26
Fracture
Not Available
Splintery
Cleavage
3,1
{010} perfect
Mohs Hardness
7-7.5
6-7.5
Chemical Composition
Mg2Al4Si5O18
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Luster
Vitreous
Vitreous, Subadamantine, Silky
Pleochroism
Not Available
Colourless to pale brown to yellow
Dispersion
Not Available
Not Available
Transparency
Transparent, Translucent, Transparent to translucent
Transparent, Translucent
Refractive Index
1.52-1.56
1.653-1.685
Optic Character
Not Available
Not Available
Crystal System
Orthorhombic
Orthorhombic
Birefringence
Not Available
0.020-0.022
Clarity
Transparent to translucent
Transparent
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
Iolite Vs Sillimanite Fracture
Fracture is an important parameter when you compare Iolite and Sillimanite Physical Properties. It is necessary to understand the significance of these properties, before you compare Iolite Vs Sillimanite 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. Sillimanite fracture is Splintery.
Iolite Vs Sillimanite Luster
A primary knowledge about Iolite vs Sillimanite 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. Iolite exhibits Vitreous luster. Sillimanite, on other hand, exhibits Vitreous, Subadamantine and Silky luster.