Annabergite and Ettringite Physical Properties

Annabergite

Ettringite

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1 Physical Properties

1.1 Tenacity

Sectile

Not Available

1.2 Solubility

Not Available

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

3.071.77

1 7.18

1.5 Fracture

Brittle, Metallic, Brittle, Metallic, Brittle, Metallic

Not Available

1.6 Cleavage

Perfect on {010}, indistinct on {100} and {102}

Perfect on {10 1 0}

1.7 Mohs Hardness

22-2.5

2 10

1.8 Chemical Composition

Ni3(AsO4)2•8(H2O)

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

Annabergite and Ettringite Chemical Formula

While comparing Annabergite 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 Annabergite and Ettringite chemical formula.

Chemical formula of Annabergite- Ni3(AsO4)2•8(H2O)
Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Annabergite and Ettringite Specific Gravity

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