Foitite and Dumortierite Physical Properties

Foitite

Dumortierite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.173.26-3.41

1 7.18

1.5 Fracture

Handbook of mineralogy (2001)

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

1.6 Cleavage

None

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

1.7 Mohs Hardness

77-8.5

2 10

1.8 Chemical Composition

Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)

AlAl₆O₃BSi₃O₁₈

Foitite and Dumortierite Chemical Formula

While comparing Foitite 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 Foitite and Dumortierite chemical formula.

Chemical formula of Foitite- Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Dumortierite- AlAl₆O₃BSi₃O₁₈

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Foitite and Dumortierite Specific Gravity

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