Common Opal and Ettringite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Partially soluble in water
Durability
Not Available
Not Available
Specific Gravity
1.98-2.50
1.77
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
Not Available
Cleavage
Not Available
Perfect on {10 1 0}
Mohs Hardness
5.5-6.5
2-2.5
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Common Opal and Ettringite Chemical Formula
While comparing Common Opal 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 Common Opal and Ettringite chemical formula.
- Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Common Opal and Ettringite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Common Opal and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Common Opal and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Common Opal is 1.77 whereas that of Ettringite is 1.77.