Dravite and Pollucite Physical Properties
Solubility
-
Readily soluble in HF
Specific Gravity
3.03-3.18
2.86-2.94
Fracture
Uneven, Irregular, Conchoidal
Conchoidal, Uneven
Cleavage
{???} Indistinct
None observed
Mohs Hardness
7-7.5
6.5-7
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
(Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references
Dravite and Pollucite Chemical Formula
While comparing Dravite and Pollucite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Dravite and Pollucite chemical formula.
- Chemical formula of Dravite- Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
- Chemical formula of Pollucite- (Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references
Dravite and Pollucite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Dravite and Pollucite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Pollucite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 2.86-2.94 whereas that of Pollucite is 2.86-2.94.