Origin
Ethiopia
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Color
Yellow, White, Red, Brown, Blue
Blue, Green, Brownish, Greenish, Colorless, gray
For which Rashi?
Cancer, Libra, Scorpio, Cancer, Libra, Scorpio, Cancer, Libra, Scorpio
Not Available
Planet
Mercury
Not Available
Element of Planets
Earth, Air, Water
Not Available
Finger
Not Available
Not Available
Ring Metal
Not Available
Not Available
Energy
Projective, Receptive
Not Available
Deities
Cupid
Not Available
Not to wear with
Not Available
Not Available
Powers
Astral Projection, Psychicism
Not Available
Planetary
Not Available
Not Available
Talisman
Not Available
Not Available
Tenacity
BrittleWalter Schumann
Tough
Solubility
hot salt water
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.98-2.25
3.20-3.26
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle
Splintery
Cleavage
None
{010} perfect
Mohs Hardness
5-6.5
6-7.5
Chemical Composition
SiO2 · nH2O
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Luster
Vitreous, Pearly
Vitreous, Subadamantine, Silky
Pleochroism
None
Colourless to pale brown to yellow
Dispersion
None
Not Available
Transparency
Transparent, Translucent, Transparent to translucent
Transparent, Translucent
Refractive Index
1.37-1.52
1.653-1.685
Optic Character
Not Available
Not Available
Crystal System
Trigonal
Orthorhombic
Birefringence
Not Available
0.020-0.022
Clarity
Transparent
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
Opal Vs Sillimanite Fracture
Fracture is an important parameter when you compare Opal and Sillimanite Physical Properties. It is necessary to understand the significance of these properties, before you compare Opal 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 Opal is Brittle, Conchoidal, Conchoidal and Gemstones of the world (2001) More from other references. Sillimanite fracture is Splintery.
Opal Vs Sillimanite Luster
A primary knowledge about Opal 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. Opal exhibits Pearly and Vitreous luster. Sillimanite, on other hand, exhibits Silky, Subadamantine and Vitreous luster.