Origin
Spain, Brazil, USA, Sri Lanka, Burma, Origins: Spain, Burma. Discovered in Andalusia (Spain)
Southern and central Africa
Color
Brown, pink, Violet, Yellow, Green, White, gray, Colorless, Red
White, Colorless, Blue, Red, Green, Yellow, Violet, Black
Specific Gravity
3.05-3.21
3.03-3.18
Fracture
Uneven, Subconchoidal, Splintery
Uneven, Irregular, Conchoidal
Cleavage
Good on {110}, poor on {100}
{???} Indistinct
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Luster
Vitreous, Greasy
Vitreous
Pleochroism
strongly trichroic
Very strong: pale yellow colorless
Transparency
Transparent, Translucent
Transparent
Refractive Index
1.627-1.650
1.614-1.666
Crystal System
Orthorhombic
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Birefringence
0.009-0.010
0.014-0.032
Clarity
Transparent
Transparent
Neurological
Enhances mental clarity and focus
-
Cardiovascular
Supports heart health
-
Psychology
Perception
Self-acceptance
Healing
Physical healing
Emotional healing
Qualities Associated
Self-Realization
Self-Exploration
Andalusite Vs Dravite Fracture
Fracture is an important parameter when you compare Andalusite and Dravite Physical Properties. It is necessary to understand the significance of these properties, before you compare Andalusite Vs Dravite 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. Dravite fracture is Uneven, Irregular and Conchoidal.
Andalusite Vs Dravite Luster
A primary knowledge about Andalusite vs Dravite 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. Dravite, on other hand, exhibits Vitreous luster.