Onyx and Pollucite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Readily soluble in HF
Durability
Not Available
Not Available
Specific Gravity
2.55-2.70
2.86-2.94
Fracture
Not Available
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Cleavage
Indiscernible
None observed
Mohs Hardness
6.5-7
6.5-7
Chemical Composition
SiO2
(Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references
Onyx and Pollucite Chemical Formula
While comparing Onyx 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 Onyx and Pollucite chemical formula.
- Chemical formula of Onyx- SiO2
- Chemical formula of Pollucite- (Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references
Onyx and Pollucite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Onyx and Pollucite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Pollucite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.86-2.94 whereas that of Pollucite is 2.86-2.94.