Achroite and Uvite Physical Properties
Specific Gravity
2.90-3.40
2.97-3.14
Fracture
Uneven, ConchoidalWalter Schumann
Uneven, Conchoidal
Cleavage
Indiscernible
{1011} Indistinct
Mohs Hardness
7-7.5
-9999
Chemical Composition
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.
Ca(Mg 3)MgAl 5(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Achroite and Uvite Chemical Formula
While comparing Achroite and Uvite 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 Achroite and Uvite chemical formula.
- Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.
- Chemical formula of Uvite- Ca(Mg 3)MgAl 5(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Achroite and Uvite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Achroite and Uvite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Uvite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 2.97-3.14 whereas that of Uvite is 2.97-3.14.