Dravite and Gahnite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.03-3.18
4.00-4.62
Fracture
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Conchoidal, Uneven
Cleavage
{???} Indistinct
Indistinct parting on [111]
Mohs Hardness
7-7.5
7.5-8
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Dravite and Gahnite Chemical Formula
While comparing Dravite and Gahnite 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 Gahnite 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 Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Dravite and Gahnite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Dravite and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Gahnite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 4.00-4.62 whereas that of Gahnite is 4.00-4.62.