Afghanite and Ettringite Physical Properties

Afghanite

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

2.55-2.651.77

1 7.18

1.5 Fracture

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle

Not Available

1.6 Cleavage

Perfect {10 1 0}

Perfect on {10 1 0}

1.7 Mohs Hardness

5.5-62-2.5

2 10

1.8 Chemical Composition

(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)

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

Afghanite and Ettringite Chemical Formula

While comparing Afghanite 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 Afghanite and Ettringite chemical formula.

Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Afghanite and Ettringite Specific Gravity

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