Riebeckite and Ettringite Physical Properties

Riebeckite

Ettringite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

3.28-3.441.77

1 7.18

1.5 Fracture

Uneven, Splintery, Brittle

Not Available

1.6 Cleavage

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

Perfect on {10 1 0}

1.7 Mohs Hardness

5.0-6.02-2.5

2 10

1.8 Chemical Composition

Not Available

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

Riebeckite and Ettringite Chemical Formula

While comparing Riebeckite 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 Riebeckite and Ettringite 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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Riebeckite and Ettringite Specific Gravity

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