Thulite and Andalusite Physical Properties

Thulite

Andalusite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.13.05-3.21

1 7.18

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Fracture

Uneven, Conchoidal

Uneven, Subconchoidal, Splintery

Cleavage

Perfect {010} imperfect {100}

Good on {110}, poor on {100}

Mohs Hardness

6-77.5

2 10

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Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Thulite and Andalusite Chemical Formula

While comparing Thulite and Andalusite 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 Thulite and Andalusite chemical formula.

Chemical formula of Thulite- Ca₂Al₃(SiO₄)₃(OH)
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Thulite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Thulite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Thulite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Thulite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.