Achroite and Hardystonite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.90-3.40
3.396-3.443
Fracture
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
Brittle, Metallic
Cleavage
Not Available
[001] good, [100] and [110] fair
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 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)
Achroite and Hardystonite Chemical Formula
While comparing Achroite and Hardystonite 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 Hardystonite 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 Hardystonite- Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)
Achroite and Hardystonite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Achroite and Hardystonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Hardystonite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 3.396-3.443 whereas that of Hardystonite is 3.396-3.443.