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