Dravite and Erythrite Physical Properties
Tenacity
Not Available
Sectile
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.03-3.18
3.06
Fracture
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Cleavage
{???} Indistinct
Perfect on {010}; poor on {100} and { 1 02}.
Mohs Hardness
7-7.5
Not Available
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Co3(AsO4)2•8(H2O)
Dravite and Erythrite Chemical Formula
While comparing Dravite and Erythrite 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 Erythrite 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 Erythrite- Co3(AsO4)2•8(H2O)
Dravite and Erythrite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Dravite and Erythrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Erythrite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 3.06 whereas that of Erythrite is 3.06.