Riebeckite and Anhydrite Physical Properties

Riebeckite

Anhydrite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.28-3.442.90-2.98

1 7.18

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Fracture

Uneven, Splintery

Conchoidal

Cleavage

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

Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.

Mohs Hardness

5.0-6.03.5

2 10

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Chemical Composition

Na2Fe2+3Fe3+2Si8O22(OH)2

CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Riebeckite and Anhydrite Chemical Formula

While comparing Riebeckite and Anhydrite 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 Anhydrite chemical formula.

Chemical formula of Riebeckite- Na2Fe2+3Fe3+2Si8O22(OH)2
Chemical formula of Anhydrite- CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Riebeckite and Anhydrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Riebeckite and Anhydrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Riebeckite and Anhydrite Optical Properties during the identification of gemstone. Specific gravity of Riebeckite is 2.90-2.98 whereas that of Anhydrite is 2.90-2.98.