Andalusite Vs Bertrandite
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
Colorless, Yellow
Specific Gravity
3.05-3.21
2.59-2.60
Fracture
Uneven, Subconchoidal, Splintery
-
Cleavage
Good on {110}, poor on {100}
{001} Perfect, {110} Distinct, {101} Distinct
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
Luster
Vitreous, Greasy
Vitreous
Pleochroism
strongly trichroic
none.
Transparency
Transparent, Translucent
TransparentAnthony et al
Refractive Index
1.627-1.650
1.583-1.614
Crystal System
Orthorhombic
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21
Birefringence
0.009-0.010
-9999
Clarity
Transparent
TransparentAnthony et al
Neurological
Enhances mental clarity and focus
-
Cardiovascular
Supports heart health
Promotes mental clarity
Psychology
Perception
Harmony
Healing
Physical healing
Emotional healing
Qualities Associated
Self-Realization
Creativity
Andalusite Vs Bertrandite Fracture
Fracture is an important parameter when you compare Andalusite and Bertrandite Physical Properties. It is necessary to understand the significance of these properties, before you compare Andalusite Vs Bertrandite 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.
Andalusite Vs Bertrandite Luster
A primary knowledge about Andalusite vs Bertrandite 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. Bertrandite, on other hand, exhibits Vitreous luster.