Dumortierite and Anhydrite Physical Properties

Dumortierite

Anhydrite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.26-3.412.90-2.98

1 7.18

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Fracture

Fibrous, ConchoidalWalter Schumann

Conchoidal

Cleavage

Distinct on {100}, poor on {110}; parting on {001}

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

Mohs Hardness

7-8.53.5

2 10

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Chemical Composition

AlAl₆O₃BSi₃O₁₈

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

Dumortierite and Anhydrite Chemical Formula

While comparing Dumortierite 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 Dumortierite and Anhydrite chemical formula.

Chemical formula of Dumortierite- AlAl₆O₃BSi₃O₁₈
Chemical formula of Anhydrite- CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Dumortierite and Anhydrite Specific Gravity

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