Dumortierite and Erythrite Physical Properties

Dumortierite

Erythrite

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1 Physical Properties

1.1 Tenacity

Not Available

Sectile

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.26-3.413.06

1 7.18

1.5 Fracture

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

Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

1.6 Cleavage

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

Perfect on {010}; poor on {100} and { 1 02}.

1.7 Mohs Hardness

7-8.5Not Available

2 10

1.8 Chemical Composition

AlAl₆O₃BSi₃O₁₈

Co3(AsO4)2•8(H2O)

Dumortierite and Erythrite Chemical Formula

While comparing Dumortierite and Erythrite 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 Erythrite chemical formula.

Chemical formula of Dumortierite- AlAl₆O₃BSi₃O₁₈
Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)

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Dumortierite and Erythrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Dumortierite and Erythrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dumortierite and Erythrite Optical Properties during the identification of gemstone. Specific gravity of Dumortierite is 3.06 whereas that of Erythrite is 3.06.