Corundum and Tourmaline Physical Properties
Tenacity
Brittle
Not Available
Solubility
insoluble
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.90-4.05
2.85-3.35
Fracture
Uneven, Uneven, Gems, Difficult, Fibrous
Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)
Cleavage
None – parting in 3 directions
Indistinct
Chemical Composition
Al 2O 3Arthur Thomas , Gemstones (2009)
Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.
Corundum and Tourmaline Chemical Formula
While comparing Corundum and Tourmaline 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 Corundum and Tourmaline chemical formula.
- Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
- Chemical formula of Tourmaline- Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.
Corundum and Tourmaline Specific Gravity
Another important criteria for qualitative analysis of gemstones is Corundum and Tourmaline Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Tourmaline Optical Properties during the identification of gemstone. Specific gravity of Corundum is 2.85-3.35 whereas that of Tourmaline is 2.85-3.35.