Origin
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Brazil, Madagascar, Zambia, Sri Lanka, Burma, Russia, USA, Afghanistan
Color
Blue, Green, Brownish, Greenish, Colorless, gray
Green, Blue, Yellow, Red, Brown, White, Colorless, pink
Element of Planets
-
Water
Specific Gravity
3.20-3.26
2.85-3.35
Fracture
Splintery
Uneven, Conchoidal
Cleavage
{010} perfect
Indistinct
Mohs Hardness
6-7.5
7-7.5
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.
Luster
Vitreous, Subadamantine, Silky
Vitreous
Pleochroism
Colourless to pale brown to yellow
typically moderate to strong
Transparency
Transparent, Translucent
Transparent, Translucent, Transparent to opaque
Refractive Index
1.653-1.685
1.614-1.666
Crystal System
Orthorhombic
Trigonal
Birefringence
0.020-0.022
0.014-0.040
Clarity
Transparent
Transparent
Neurological
-
Aids in mental clarity and focus
Digestive
-
Supports digestive health
Psychology
Creativity
Protection
Healing
Emotional healing
Emotional healing
Qualities Associated
Creativity
Protection
Sillimanite Vs Tourmaline Fracture
Fracture is an important parameter when you compare Sillimanite and Tourmaline Physical Properties. It is necessary to understand the significance of these properties, before you compare Sillimanite Vs Tourmaline 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. Tourmaline fracture is Uneven and Conchoidal.
Sillimanite Vs Tourmaline Luster
A primary knowledge about Sillimanite vs Tourmaline 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. Tourmaline, on other hand, exhibits Vitreous luster.