Ettringite and Ajoite Physical Properties

Ettringite

Ajoite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Partially soluble in water

Decomposed by acids

1.3 Durability

Not Available

1.4 Specific Gravity

1.772.96

1 7.18

1.5 Fracture

Not Available

1.6 Cleavage

Perfect on {10 1 0}

Perfect on {010}

1.7 Mohs Hardness

2-2.55

2 10

1.8 Chemical Composition

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

(K,Na)3Cu20Al3Si29O76(OH)16•~8(H2O)

Ettringite and Ajoite Chemical Formula

While comparing Ettringite and Ajoite 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 Ajoite chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Ajoite- (K,Na)3Cu20Al3Si29O76(OH)16•~8(H2O)

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Ettringite and Ajoite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Ajoite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Ajoite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.96 whereas that of Ajoite is 2.96.