Rock Crystal and Corundum Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
insoluble
Durability
Not Available
Not Available
Specific Gravity
2.65
3.90-4.05
Fracture
ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)
Uneven, Uneven, Gems, Difficult, Fibrous
Cleavage
Not Available
None – parting in 3 directions
Chemical Composition
SiO 2Walter Schumann , Gemstones of the world (2001)
Al 2O 3Arthur Thomas , Gemstones (2009)
Rock Crystal and Corundum Chemical Formula
While comparing Rock Crystal and Corundum 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 Rock Crystal and Corundum chemical formula.
- Chemical formula of Rock Crystal- SiO 2Walter Schumann , Gemstones of the world (2001)
- Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Rock Crystal and Corundum Specific Gravity
Another important criteria for qualitative analysis of gemstones is Rock Crystal and Corundum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Rock Crystal and Corundum Optical Properties during the identification of gemstone. Specific gravity of Rock Crystal is 3.90-4.05 whereas that of Corundum is 3.90-4.05.