Rossmanite and Dumortierite Physical Properties

Rossmanite

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

33.26-3.41

1 7.18

1.5 Fracture

Brittle, Metallic

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

Not Available7-8.5

2 10

1.8 Chemical Composition

◻(LiAl 2)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

AlAl₆O₃BSi₃O₁₈

Rossmanite and Dumortierite Chemical Formula

While comparing Rossmanite 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 Rossmanite and Dumortierite chemical formula.

Chemical formula of Rossmanite- ◻(LiAl 2)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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Rossmanite and Dumortierite Specific Gravity

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