Ettringite and Gedrite Physical Properties

Ettringite and Gedrite Chemical Formula

While comparing Ettringite and Gedrite 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 Gedrite chemical formula.

• Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Gedrite- (Mg,Fe2+ ) 2[(Mg,Fe2+ ) 3Al 2](Si 6Al 2)O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)

Ettringite and Gedrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Gedrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Gedrite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 3.15-3.259 whereas that of Gedrite is 3.15-3.259.