Ruby and Andalusite Physical Properties

Ruby

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

3.97-4.053.05-3.21

1 7.18

1.5 Fracture

Conchoidal

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

1.6 Cleavage

No true cleavage

Good on {110}, poor on {100}

1.7 Mohs Hardness

97.5

2 10

1.8 Chemical Composition

Al ₂ O ₃

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

Ruby and Andalusite Chemical Formula

While comparing Ruby 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 Ruby and Andalusite chemical formula.

Chemical formula of Ruby- Al ₂ O ₃
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Ruby and Andalusite Specific Gravity

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