Dravite and Herderite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.03-3.18
2.90-3.02
Fracture
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Cleavage
{???} Indistinct
Indistinct on {110}
Mohs Hardness
7-7.5
5-5.5
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
CaBePO 4(F,OH)Ulrich Henn and Claudio C.
Dravite and Herderite Chemical Formula
While comparing Dravite and Herderite 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 Herderite 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 Herderite- CaBePO 4(F,OH)Ulrich Henn and Claudio C.
Dravite and Herderite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Dravite and Herderite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Herderite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 2.90-3.02 whereas that of Herderite is 2.90-3.02.