Dravite and Hercynite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.03-3.18
4.39
Fracture
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
ConchoidalGemdat.org, Uneven
Cleavage
{???} Indistinct
{111} Indistinct, {111} Indistinct, {111} Indistinct
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)
Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
Dravite and Hercynite Chemical Formula
While comparing Dravite and Hercynite 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 Hercynite 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 Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
Dravite and Hercynite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Dravite and Hercynite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Hercynite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 4.39 whereas that of Hercynite is 4.39.