Fluorapatite and Ettringite Physical Properties

Fluorapatite and Ettringite Chemical Formula

While comparing Fluorapatite 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 Fluorapatite and Ettringite chemical formula.

• Chemical formula of Fluorapatite- Ca 5(PO 4) 3FAnthony et al , Handbook of mineralogy (2001)
• Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)

Fluorapatite and Ettringite Specific Gravity

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