Alabaster and Black Opal Physical Properties

Alabaster and Black Opal Chemical Formula

While comparing Alabaster and Black 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 Alabaster and Black Opal chemical formula.

• Chemical formula of Alabaster- CaSO 4 · 2H 2OWalter Schumann , Gemstones of the world (2001)
• Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

Alabaster and Black Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alabaster and Black Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alabaster and Black Opal Optical Properties during the identification of gemstone. Specific gravity of Alabaster is 1.97-2.22 whereas that of Black Opal is 1.97-2.22.