Dravite and Corundum Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
insoluble
Durability
Not Available
Not Available
Specific Gravity
3.03-3.18
3.90-4.05
Fracture
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Uneven, Uneven, Gems, Difficult, Fibrous
Cleavage
{???} Indistinct
None – parting in 3 directions
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Al 2O 3Arthur Thomas , Gemstones (2009)
Dravite and Corundum Chemical Formula
While comparing Dravite 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 Dravite and Corundum chemical formula.
- Chemical formula of Dravite- Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
- Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Dravite and Corundum Specific Gravity
Another important criteria for qualitative analysis of gemstones is Dravite and Corundum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Corundum Optical Properties during the identification of gemstone. Specific gravity of Dravite is 3.90-4.05 whereas that of Corundum is 3.90-4.05.