Ruby and Purpurite Physical Properties

Ruby

Purpurite

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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

3.97-4.053.2-3.4

1 7.18

1.5 Fracture

Conchoidal

Uneven, UnevenArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

No true cleavage

[100] [001] perfect

1.7 Mohs Hardness

94-4.5

2 10

1.8 Chemical Composition

Al ₂ O ₃

MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references

Ruby and Purpurite Chemical Formula

While comparing Ruby and Purpurite 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 Purpurite chemical formula.

Chemical formula of Ruby- Al ₂ O ₃
Chemical formula of Purpurite- MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references

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Ruby and Purpurite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ruby and Purpurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ruby and Purpurite Optical Properties during the identification of gemstone. Specific gravity of Ruby is 3.2-3.4 whereas that of Purpurite is 3.2-3.4.