Topaz and Oligoclase Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.49-3.57
2.62-2.67
Fracture
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Gems, Sixth Edition (2006), Gems, Sixth Edition (2006), Uneven
Cleavage
[001] Perfect
From the Greek, oligos and kasein, little cleavage.
Chemical Composition
Al2SiO4(F,OH)2
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Topaz and Oligoclase Chemical Formula
While comparing Topaz and Oligoclase 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 Topaz and Oligoclase chemical formula.
- Chemical formula of Topaz- Al2SiO4(F,OH)2
- Chemical formula of Oligoclase- Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Topaz and Oligoclase Specific Gravity
Another important criteria for qualitative analysis of gemstones is Topaz and Oligoclase Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Oligoclase Optical Properties during the identification of gemstone. Specific gravity of Topaz is 2.62-2.67 whereas that of Oligoclase is 2.62-2.67.