Sillimanite and Pollucite Physical Properties
Solubility
Not Available
Readily soluble in HF
Durability
Not Available
Not Available
Specific Gravity
3.20-3.26
2.86-2.94
Fracture
Splintery
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Cleavage
{010} perfect
None observed
Mohs Hardness
6-7.5
6.5-7
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
(Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references
Sillimanite and Pollucite Chemical Formula
While comparing Sillimanite 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 Sillimanite and Pollucite chemical formula.
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Pollucite- (Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references
Sillimanite and Pollucite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sillimanite and Pollucite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Pollucite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.86-2.94 whereas that of Pollucite is 2.86-2.94.