Hardystonite and Andalusite Physical Properties

Hardystonite

Andalusite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.396-3.4433.05-3.21

1 7.18

1.5 Fracture

Brittle, Metallic

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

1.6 Cleavage

[001] good, [100] and [110] fair

Good on {110}, poor on {100}

1.7 Mohs Hardness

3-47.5

2 10

1.8 Chemical Composition

Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)

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

Hardystonite and Andalusite Chemical Formula

While comparing Hardystonite 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 Hardystonite and Andalusite chemical formula.

Chemical formula of Hardystonite- Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Hardystonite and Andalusite Specific Gravity

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