Oligoclase and Sillimanite Physical Properties
Tenacity
Not Available
Tough
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.62-2.67
3.20-3.26
Fracture
Gems, Sixth Edition (2006), Gems, Sixth Edition (2006), Uneven
Splintery
Cleavage
From the Greek, oligos and kasein, little cleavage.
{010} perfect
Mohs Hardness
6-6.5
6-7.5
Chemical Composition
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Oligoclase and Sillimanite Chemical Formula
While comparing Oligoclase and Sillimanite 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 Oligoclase and Sillimanite chemical formula.
- Chemical formula of Oligoclase- Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Oligoclase and Sillimanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Oligoclase and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Oligoclase and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Oligoclase is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.