Dravite and Bytownite Physical Properties
Specific Gravity
3.03-3.18
2.72-2.75
Fracture
Uneven, Irregular, Conchoidal
Uneven
Cleavage
{???} Indistinct
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
7-7.5
6-6.5
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Dravite and Bytownite Chemical Formula
While comparing Dravite and Bytownite 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 Bytownite 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 Bytownite- Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Dravite and Bytownite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Dravite and Bytownite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Bytownite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 2.72-2.75 whereas that of Bytownite is 2.72-2.75.