Aragonite and Ettringite Physical Properties

Aragonite

Ettringite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Dilute acid

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

2.93-2.961.77

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

Distinct on {010}, imperfect {110} and {011}

Perfect on {10 1 0}

1.7 Mohs Hardness

3.5-42-2.5

2 10

1.8 Chemical Composition

CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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

Aragonite and Ettringite Chemical Formula

While comparing Aragonite 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 Aragonite and Ettringite chemical formula.

Chemical formula of Aragonite- CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Aragonite and Ettringite Specific Gravity

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