Origin
Southern and central Africa
Australia, Southern and central Africa, green, brown, Australia, France, green, brown, Australia, France
Color
White, Colorless, Blue, Red, Green, Yellow, Violet, Black, Green, Red, Blue, White
Green, Colorless, gray, Yellow, White
Streak
Colorless
Colorless
For which Rashi?
Not Available
Libra
Planet
Not Available
Venus
Element of Planets
Not Available
Earth
Energy
Not Available
Receptive
Finger
Not Available
Not Available
Ring Metal
Not Available
Not Available
Deities
Not Available
Freya
Not to wear with
Not Available
Not Available
Powers
Not Available
Not Available
Planetary
Not Available
Not Available
Talisman
Not Available
Not Available
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.03-3.18
2.80-2.95
Fracture
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic
Cleavage
{???} Indistinct
Distinct on [001]
Mohs Hardness
7-7.5
6-6.5
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Ca2Al2Si3O12(OH)
Pleochroism
Very strong: pale yellow colorless
AbsentWalter Schumann
Transparency
Transparent
Translucent
Refractive Index
1.614-1.666
1.611-1.673
Optic Character
Not Available
Not Available
Crystal System
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Orthorhombic
Birefringence
0.014-0.032
0.021-0.033
Clarity
Transparent
TranslucentHerve Nicolas Lazzarelli
Neurological
Not Available
Not Available
Cardiovascular
Not Available
Not Available
Respiratory
Not Available
Not Available
Reproductive
Not Available
Not Available
Digestive
Not Available
Not Available
Psychology
Not Available
Not Available
Healing
Not Available
Not Available
Qualities Associated
Not Available
Not Available
Dravite Vs Prehnite Fracture
Fracture is an important parameter when you compare Dravite and Prehnite Physical Properties. It is necessary to understand the significance of these properties, before you compare Dravite Vs Prehnite 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 Dravite is Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal and Brittle. Prehnite fracture is Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle and Metallic.
Dravite Vs Prehnite Luster
A primary knowledge about Dravite vs Prehnite 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. Dravite exhibits Vitreous luster. Prehnite, on other hand, exhibits Vitreous luster.