Origin
Spain, Brazil, USA, Sri Lanka, Burma, Origins: Spain, Burma. Discovered in Andalusia (Spain)
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Color
Brown, pink, Violet, Yellow, Green, White, gray, Colorless, Red
Blue, Green, Brownish, Greenish, Colorless, gray
Specific Gravity
3.05-3.21
3.20-3.26
Fracture
Uneven, Subconchoidal, Splintery
Splintery
Cleavage
Good on {110}, poor on {100}
{010} perfect
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Luster
Vitreous, Greasy
Vitreous, Subadamantine, Silky
Pleochroism
strongly trichroic
Colourless to pale brown to yellow
Transparency
Transparent, Translucent
Transparent, Translucent
Refractive Index
1.627-1.650
1.653-1.685
Crystal System
Orthorhombic
Orthorhombic
Birefringence
0.009-0.010
0.020-0.022
Clarity
Transparent
Transparent
Neurological
Enhances mental clarity and focus
-
Cardiovascular
Supports heart health
-
Respiratory
Excellent
Good
Psychology
Perception
Creativity
Healing
Physical healing
Emotional healing
Qualities Associated
Self-Realization
Creativity
Andalusite Vs Sillimanite Fracture
Fracture is an important parameter when you compare Andalusite and Sillimanite Physical Properties. It is necessary to understand the significance of these properties, before you compare Andalusite 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 Andalusite is Uneven, Subconchoidal and Splintery. Sillimanite fracture is Splintery.
Andalusite Vs Sillimanite Luster
A primary knowledge about Andalusite 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. Andalusite exhibits Vitreous and Greasy luster. Sillimanite, on other hand, exhibits Vitreous, Subadamantine and Silky luster.