Polyhalite and Dumortierite Physical Properties

Polyhalite

Dumortierite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.783.26-3.41

1 7.18

1.5 Fracture

Conchoidal, Brittle

Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references

1.6 Cleavage

Perfect on {10 1 }; parting on {010}

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

1.7 Mohs Hardness

3.57-8.5

2 10

1.8 Chemical Composition

Not Available

AlAl₆O₃BSi₃O₁₈

Polyhalite and Dumortierite Chemical Formula

While comparing Polyhalite and Dumortierite 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 Polyhalite and Dumortierite chemical formula.

Chemical formula of Dumortierite- AlAl₆O₃BSi₃O₁₈

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Polyhalite and Dumortierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Dumortierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Dumortierite Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 3.26-3.41 whereas that of Dumortierite is 3.26-3.41.