Annabergite and Ettringite Physical Properties
Tenacity
Sectile
Not Available
Solubility
Not Available
Partially soluble in water
Durability
Not Available
Not Available
Specific Gravity
3.07
1.77
Fracture
Brittle, Metallic, Brittle, Metallic, Brittle, Metallic
Not Available
Cleavage
Perfect on {010}, indistinct on {100} and {102}
Perfect on {10 1 0}
Chemical Composition
Ni3(AsO4)2•8(H2O)
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Annabergite and Ettringite Chemical Formula
While comparing Annabergite 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 Annabergite and Ettringite chemical formula.
- Chemical formula of Annabergite- Ni3(AsO4)2•8(H2O)
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Annabergite and Ettringite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Annabergite and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Annabergite and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Annabergite is 1.77 whereas that of Ettringite is 1.77.