Dravite and Onyx Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.03-3.18
2.55-2.70
Fracture
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Not Available
Cleavage
{???} Indistinct
Indiscernible
Mohs Hardness
7-7.5
6.5-7
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
SiO2
Dravite and Onyx Chemical Formula
While comparing Dravite and Onyx 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 Onyx 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 Onyx- SiO2
Dravite and Onyx Specific Gravity
Another important criteria for qualitative analysis of gemstones is Dravite and Onyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Onyx Optical Properties during the identification of gemstone. Specific gravity of Dravite is 2.55-2.70 whereas that of Onyx is 2.55-2.70.