Hercynite and Dravite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
4.39
3.03-3.18
Fracture
ConchoidalGemdat.org, Uneven
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
{???} Indistinct
Mohs Hardness
7.5-8
7-7.5
Chemical Composition
Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Hercynite and Dravite Chemical Formula
While comparing Hercynite 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 Hercynite and Dravite chemical formula.
- Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
- Chemical formula of Dravite- Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Hercynite and Dravite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Hercynite and Dravite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hercynite and Dravite Optical Properties during the identification of gemstone. Specific gravity of Hercynite is 3.03-3.18 whereas that of Dravite is 3.03-3.18.