Dravite and Austinite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Easily soluble in cold dilute HCl
Durability
Not Available
Not Available
Specific Gravity
3.03-3.18
4.12
Fracture
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Brittle, Uneven, Brittle, Uneven
Cleavage
{???} Indistinct
Good in two directions parallel to the prism faces {110}
Mohs Hardness
7-7.5
4-4.5
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
CaZn(AsO4)(OH)
Dravite and Austinite Chemical Formula
While comparing Dravite and Austinite 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 Austinite 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 Austinite- CaZn(AsO4)(OH)
Dravite and Austinite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Dravite and Austinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Austinite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 4.12 whereas that of Austinite is 4.12.