Dumortierite Vs Sillimanite
Origin
Southern and central Africa
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Color
Blue, Violet, Brown, White, Greenish, pink
Blue, Green, Brownish, Greenish, Colorless, gray
For which Rashi?
Leo, Sagittarius
-
Element of Planets
Water
-
Specific Gravity
3.26-3.41
3.20-3.26
Fracture
Fibrous, ConchoidalWalter Schumann
Splintery
Cleavage
Distinct on {100}, poor on {110}; parting on {001}
{010} perfect
Mohs Hardness
7-8.5
6-7.5
Chemical Composition
AlAl6O3BSi3O18
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Luster
Vitreous
Vitreous, Subadamantine, Silky
Pleochroism
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue
Colourless to pale brown to yellow
Transparency
Translucent, Translucent to opaque
Transparent, Translucent
Refractive Index
1.669-1.723
1.653-1.685
Crystal System
Orthorhombic
Orthorhombic
Birefringence
0.011-0.037
0.020-0.022
Clarity
Translucent
Transparent
Neurological
Enhances mental clarity and focus
-
Psychology
Patience
Creativity
Healing
Emotional healing
Emotional healing
Qualities Associated
Patience
Creativity
Dumortierite Vs Sillimanite Fracture
Fracture is an important parameter when you compare Dumortierite and Sillimanite Physical Properties. It is necessary to understand the significance of these properties, before you compare Dumortierite 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. Fracture observed in Dumortierite is Fibrous and ConchoidalWalter Schumann. Sillimanite fracture is Splintery.
Dumortierite Vs Sillimanite Luster
A primary knowledge about Dumortierite 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. Dumortierite exhibits Vitreous luster. Sillimanite, on other hand, exhibits Vitreous, Subadamantine and Silky luster.