Ruby and Pyrope Physical Properties

Ruby

Pyrope

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

insoluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

3.97-4.053.62-3.87

1 7.18

1.5 Fracture

Conchoidal

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

No true cleavage

None

1.7 Mohs Hardness

97-7.5

2 10

1.8 Chemical Composition

Al ₂ O ₃

Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Ruby and Pyrope Chemical Formula

While comparing Ruby and Pyrope 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 Pyrope chemical formula.

Chemical formula of Ruby- Al ₂ O ₃
Chemical formula of Pyrope- Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

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Ruby and Pyrope Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ruby and Pyrope Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ruby and Pyrope Optical Properties during the identification of gemstone. Specific gravity of Ruby is 3.62-3.87 whereas that of Pyrope is 3.62-3.87.