Peridot and Ettringite Physical Properties

Peridot

Ettringite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

1.54-1.551.77

1 7.18

1.5 Fracture

Conchoidal

Not Available

1.6 Cleavage

Poor

Perfect on {10 1 0}

1.7 Mohs Hardness

6.5-72-2.5

2 10

1.8 Chemical Composition

(Mg,Fe)₂SiO₄

Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

Peridot and Ettringite Chemical Formula

While comparing Peridot 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 Peridot and Ettringite chemical formula.

Chemical formula of Peridot- (Mg,Fe)₂SiO₄
Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Peridot and Ettringite Specific Gravity

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