Dravite and Purpurite Physical Properties

Dravite

Purpurite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

3.03-3.18

Uneven, Irregular, Conchoidal

{???} Indistinct

7-7.5

Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

3.2-3.4

Uneven

[100] [001] perfect

4-4.5

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

Dravite and Purpurite Chemical Formula

While comparing Dravite 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 Dravite and Purpurite chemical formula.

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Dravite and Purpurite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Dravite and Purpurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite Vs Purpurite during the identification of gemstone. Specific gravity of Dravite is whereas that of Purpurite is .