Almandine and Purpurite Physical Properties

Almandine

Purpurite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.30

3.2-3.4

1.5 Fracture

Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal

Uneven, UnevenArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

none

[100] [001] perfect

1.7 Mohs Hardness

7-7.5

4-4.5

1.8 Chemical Composition

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

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

Almandine and Purpurite Chemical Formula

While comparing Almandine 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 Almandine and Purpurite chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Purpurite- MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references

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Almandine and Purpurite Specific Gravity

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