Calcite and Ettringite Physical Properties
Tenacity
Brittle
Not Available
Solubility
Soluble
Partially soluble in water
Durability
Not Available
Not Available
Specific Gravity
2.67-2.73
1.77
Fracture
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Not Available
Cleavage
Perfect on [10 1 1] three directions with angle of 74° 55
Perfect on {10 1 0}
Chemical Composition
CaCO 3Ulrich Henn and Claudio C.
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Calcite and Ettringite Chemical Formula
While comparing Calcite and Ettringite 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 Calcite and Ettringite chemical formula.
- Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Calcite and Ettringite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Calcite and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Calcite and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Calcite is 1.77 whereas that of Ettringite is 1.77.