Tanzanite and Andalusite Physical Properties

Tanzanite

Andalusite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Hard

Not Available

1.4 Specific Gravity

3.35

3.05-3.21

1.5 Fracture

Uneven, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)

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

1.6 Cleavage

Perfect {010}, imperfect {100}

Good on {110}, poor on {100}

1.7 Mohs Hardness

6.5-7

7.5

1.8 Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

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

Tanzanite and Andalusite Chemical Formula

While comparing Tanzanite 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 Tanzanite and Andalusite chemical formula.

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

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Tanzanite and Andalusite Specific Gravity

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