Alabaster and Ettringite Physical Properties

Alabaster and Ettringite Chemical Formula

While comparing Alabaster 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 Alabaster and Ettringite chemical formula.

• Chemical formula of Alabaster- CaSO 4 · 2H 2OWalter Schumann , Gemstones of the world (2001)
• Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)

Alabaster and Ettringite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alabaster and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alabaster and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Alabaster is 1.77 whereas that of Ettringite is 1.77.