Andalusite and Charlesite Physical Properties

Andalusite

Charlesite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.05-3.21

1.79

1.5 Fracture

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

Irregular/uneven, Brittle, Metallic

1.6 Cleavage

Good on {110}, poor on {100}

Perfect on {10bar10}

1.7 Mohs Hardness

7.5

2.5

1.8 Chemical Composition

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

Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)

Andalusite and Charlesite Chemical Formula

While comparing Andalusite and Charlesite 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 Andalusite and Charlesite chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Charlesite- Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)

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Andalusite and Charlesite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Charlesite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Charlesite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 1.79 whereas that of Charlesite is 1.79.