Origin
Spain, Brazil, USA, Sri Lanka, Burma, Origins: Spain, Burma. Discovered in Andalusia (Spain)
Mexico
Color
Brown, pink, Violet, Yellow, Green, White, gray, Colorless, Red
Colorless, Blue, Violet, White, Brown, rose, gray
Specific Gravity
3.05-3.21
2.90-2.98
Fracture
Uneven, Subconchoidal, Splintery
Conchoidal
Cleavage
Good on {110}, poor on {100}
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Luster
Vitreous, Greasy
Pearly, Greasy
Pleochroism
strongly trichroic
For violet varieties
Transparency
Transparent, Translucent
Transparent
Refractive Index
1.627-1.650
1.570-1.614
Crystal System
Orthorhombic
Orthorhombic
Birefringence
0.009-0.010
0.042-0.044
Clarity
Transparent
Transparent
Neurological
Enhances mental clarity and focus
Enhances mental clarity and focus
Cardiovascular
Supports heart health
Supports heart health
Respiratory
Excellent
Good
Psychology
Perception
Calmness
Healing
Physical healing
Emotional healing
Qualities Associated
Self-Realization
Acceptance
Andalusite Vs Anhydrite Fracture
Fracture is an important parameter when you compare Andalusite and Anhydrite Physical Properties. It is necessary to understand the significance of these properties, before you compare Andalusite Vs Anhydrite 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. Anhydrite fracture is Conchoidal.
Andalusite Vs Anhydrite Luster
A primary knowledge about Andalusite vs Anhydrite 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. Anhydrite, on other hand, exhibits Pearly and Greasy luster.