Bertrandite Vs Anhydrite
Origin
Southern and central Africa
Mexico
Color
Colorless, Yellow
Colorless, Blue, Violet, White, Brown, rose, gray
Specific Gravity
2.59-2.60
2.90-2.98
Cleavage
{001} Perfect, {110} Distinct, {101} Distinct
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Chemical Composition
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Luster
Vitreous
Pearly, Greasy
Pleochroism
none.
For violet varieties
Transparency
TransparentAnthony et al
Transparent
Refractive Index
1.583-1.614
1.570-1.614
Crystal System
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21
Orthorhombic
Birefringence
-9999
0.042-0.044
Clarity
TransparentAnthony et al
Transparent
Neurological
-
Enhances mental clarity and focus
Cardiovascular
Promotes mental clarity
Supports heart health
Psychology
Harmony
Calmness
Healing
Emotional healing
Emotional healing
Qualities Associated
Creativity
Acceptance
Bertrandite Vs Anhydrite Fracture
Fracture is an important parameter when you compare Bertrandite and Anhydrite Physical Properties. It is necessary to understand the significance of these properties, before you compare Bertrandite 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. Anhydrite fracture is Conchoidal.
Bertrandite Vs Anhydrite Luster
A primary knowledge about Bertrandite 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. Bertrandite exhibits Vitreous luster. Anhydrite, on other hand, exhibits Pearly and Greasy luster.