Dravite and Dumortierite Physical Properties

Dravite

Dumortierite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.03-3.183.26-3.41

1 7.18

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Fracture

Uneven, Irregular, Conchoidal

Fibrous, ConchoidalWalter Schumann

Cleavage

{???} Indistinct

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

Mohs Hardness

7-7.57-8.5

2 10

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Chemical Composition

Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

AlAl₆O₃BSi₃O₁₈

Dravite and Dumortierite Chemical Formula

While comparing Dravite 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 Dravite and Dumortierite chemical formula.

Chemical formula of Dravite- Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Chemical formula of Dumortierite- AlAl₆O₃BSi₃O₁₈

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Dravite and Dumortierite Specific Gravity

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