Ettringite and Hardystonite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Partially soluble in water
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.77
3.396-3.443
Fracture
Not Available
Brittle, Metallic
Cleavage
Perfect on {10 1 0}
[001] good, [100] and [110] fair
Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)
Ettringite and Hardystonite Chemical Formula
While comparing Ettringite 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 Ettringite and Hardystonite chemical formula.
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Hardystonite- Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)
Ettringite and Hardystonite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Ettringite and Hardystonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Hardystonite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 3.396-3.443 whereas that of Hardystonite is 3.396-3.443.