Tourmaline and Purpurite Physical Properties

Tourmaline

Purpurite

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2 Physical Properties

2.2 Tenacity

Not Available

2.4 Solubility

Not Available

2.6 Durability

Not Available

2.7 Specific Gravity

2.85-3.353.2-3.4

1 7.18

2.8 Fracture

Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)

Uneven, UnevenArthur Thomas, Gemstones (2009), Brittle

2.9 Cleavage

Indistinct

[100] [001] perfect

2.10 Mohs Hardness

7-7.54-4.5

2 10

2.13 Chemical Composition

Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.

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

Tourmaline and Purpurite Chemical Formula

While comparing Tourmaline 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 Tourmaline and Purpurite chemical formula.

Chemical formula of Tourmaline- Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.
Chemical formula of Purpurite- MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references

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Tourmaline and Purpurite Specific Gravity

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