Achroite and Nephrite Physical Properties
Specific Gravity
2.90-3.40
2.90-3.10
Fracture
Uneven, ConchoidalWalter Schumann
Splintery, Granular
Cleavage
Indiscernible
None
Mohs Hardness
7-7.5
6-6.5
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 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
Achroite and Nephrite Chemical Formula
While comparing Achroite and Nephrite 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 Nephrite 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 Nephrite- Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
Achroite and Nephrite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Achroite and Nephrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Nephrite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 2.90-3.10 whereas that of Nephrite is 2.90-3.10.