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