Ettringite and Riebeckite Physical Properties

Ettringite

Riebeckite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Partially soluble in water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.773.28-3.44

1 7.18

1.5 Fracture

Not Available

Uneven, Splintery, Brittle

1.6 Cleavage

Perfect on {10 1 0}

Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}

1.7 Mohs Hardness

2-2.55.0-6.0

2 10

1.8 Chemical Composition

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

Not Available

Ettringite and Riebeckite Chemical Formula

While comparing Ettringite and Riebeckite 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 Riebeckite chemical formula.

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

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Ettringite and Riebeckite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Riebeckite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Riebeckite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 3.28-3.44 whereas that of Riebeckite is 3.28-3.44.