Ettringite and Opal Physical Properties
Tenacity
Not Available
BrittleWalter Schumann
Solubility
Partially soluble in water
hot salt water
Durability
Not Available
Not Available
Specific Gravity
1.77
1.98-2.25
Fracture
Not Available
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle
Cleavage
Perfect on {10 1 0}
None
Mohs Hardness
2-2.5
5-6.5
Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
SiO2 · nH2O
Ettringite and Opal Chemical Formula
While comparing Ettringite and Opal 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 Opal chemical formula.
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Opal- SiO2 · nH2O
Ettringite and Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Ettringite and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Opal Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 1.98-2.25 whereas that of Opal is 1.98-2.25.