Ettringite and Gahnite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Partially soluble in water
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.77
4.00-4.62
Fracture
Not Available
Conchoidal, Uneven
Cleavage
Perfect on {10 1 0}
Indistinct parting on [111]
Mohs Hardness
2-2.5
7.5-8
Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Ettringite and Gahnite Chemical Formula
While comparing Ettringite and Gahnite 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 Gahnite chemical formula.
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Ettringite and Gahnite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Ettringite and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Gahnite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 4.00-4.62 whereas that of Gahnite is 4.00-4.62.