Andalusite and Ettringite Physical Properties

Andalusite

Ettringite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

3.05-3.21

Uneven, Subconchoidal, Splintery

Good on {110}, poor on {100}

7.5

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

Partially soluble in water

1.77

Perfect on {10 1 0}

2-2.5

Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

Andalusite and Ettringite Chemical Formula

While comparing Andalusite and Ettringite 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 Ettringite chemical formula.

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Andalusite and Ettringite Specific Gravity

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