Origin
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Ethiopia, Afghanistan, China, Australia, Origins: Brazil (major source); also found in USA, Germany, France, UK, Finland, Norway, Sweden, Namibia, Zaire, China and Australia.
Color
Blue, Green, Brownish, Greenish, Colorless, gray
Brown, Green, White, Colorless, Yellow, Blue, gray, pink, Greenish
Specific Gravity
3.20-3.26
2.98-3.10
Fracture
Splintery
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Cleavage
{010} perfect
[100] Perfect, [110] Good, [011] Distinct
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Luster
Vitreous, Subadamantine, Silky
Vitreous, Pearly
Pleochroism
Colourless to pale brown to yellow
weak to none
Transparency
Transparent, Translucent
-
Refractive Index
1.653-1.685
1.578-1.646
Optic Character
-
Biaxial/+
Crystal System
Orthorhombic
Triclinic
Birefringence
0.020-0.022
0.020-0.030
Clarity
Transparent
TransparentUlrich Henn and Claudio C. Milisenda
Neurological
-
Enhances mental clarity and focus
Respiratory
Good
Excellent
Reproductive
-
Supports reproductive health
Psychology
Creativity
Peace
Healing
Emotional healing
Emotional healing
Qualities Associated
Creativity
Peace
Sillimanite Vs Amblygonite Fracture
Fracture is an important parameter when you compare Sillimanite and Amblygonite Physical Properties. It is necessary to understand the significance of these properties, before you compare Sillimanite Vs Amblygonite 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. Amblygonite fracture is Sub-Conchoidal, Irregular/uneven, Uneven and Conchoidal.
Sillimanite Vs Amblygonite Luster
A primary knowledge about Sillimanite vs Amblygonite 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. Amblygonite, on other hand, exhibits Vitreous and Pearly luster.