Anhydrite Vs Dravite
Origin
Mexico
Southern and central Africa
Color
Colorless, Blue, Violet, White, Brown, rose, gray
White, Colorless, Blue, Red, Green, Yellow, Violet, Black
Specific Gravity
2.90-2.98
3.03-3.18
Fracture
Conchoidal
Uneven, Irregular, Conchoidal
Cleavage
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
{???} Indistinct
Chemical Composition
CaSO 4Michael 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
Pearly, Greasy
Vitreous
Pleochroism
For violet varieties
Very strong: pale yellow colorless
Transparency
Transparent
Transparent
Refractive Index
1.570-1.614
1.614-1.666
Crystal System
Orthorhombic
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Birefringence
0.042-0.044
0.014-0.032
Clarity
Transparent
Transparent
Neurological
Enhances mental clarity and focus
-
Cardiovascular
Supports heart health
-
Psychology
Calmness
Self-acceptance
Healing
Emotional healing
Emotional healing
Qualities Associated
Acceptance
Self-Exploration
Anhydrite Vs Dravite Fracture
Fracture is an important parameter when you compare Anhydrite and Dravite Physical Properties. It is necessary to understand the significance of these properties, before you compare Anhydrite 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 Anhydrite is Conchoidal. Dravite fracture is Uneven, Irregular and Conchoidal.
Anhydrite Vs Dravite Luster
A primary knowledge about Anhydrite 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. Anhydrite exhibits Pearly and Greasy luster. Dravite, on other hand, exhibits Vitreous luster.