Sillimanite Vs Zoisite
Origin
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Pakistan, Tanzania
Color
Blue, Green, Brownish, Greenish, Colorless, gray
Brown, gray, Green, Blue, rose, Red
Streak
White
White, Colorless
Specific Gravity
3.20-3.26
3.20-3.50
Fracture
Splintery
Uneven, Conchoidal, Even
Cleavage
{010} perfect
Perfect {010} imperfect {100}
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Ca2Al3(SiO4)3(OH)
Luster
Vitreous, Subadamantine, Silky
Vitreous
Pleochroism
Colourless to pale brown to yellow
X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green
Transparency
Transparent, Translucent
Transparent, Translucent, Opaque . May be translucent in thin backlit sections.
Refractive Index
1.653-1.685
1.685-1.707
Crystal System
Orthorhombic
Orthorhombic
Birefringence
0.020-0.022
0.006-0.018
Clarity
Transparent
Transparent
Cardiovascular
-
Supports heart health
Respiratory
Good
Excellent
Reproductive
-
Supports reproductive health
Psychology
Creativity
Transformation
Healing
Emotional healing
Emotional healing
Qualities Associated
Creativity
-
Sillimanite Vs Zoisite Fracture
Fracture is an important parameter when you compare Sillimanite and Zoisite Physical Properties. It is necessary to understand the significance of these properties, before you compare Sillimanite Vs Zoisite 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. Zoisite fracture is Uneven, Conchoidal and Even.
Sillimanite Vs Zoisite Luster
A primary knowledge about Sillimanite vs Zoisite 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. Zoisite, on other hand, exhibits Vitreous luster.