Crystal Opal and Purpurite Physical Properties

Crystal Opal

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

1.97-2.223.2-3.4

1 7.18

1.5 Fracture

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

Uneven, UnevenArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

Not Available

[100] [001] perfect

1.7 Mohs Hardness

5.5-6.54-4.5

2 10

1.8 Chemical Composition

SiO 2 + H 2OUlrich Henn and Claudio C.

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

Crystal Opal and Purpurite Chemical Formula

While comparing Crystal Opal 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 Crystal Opal and Purpurite chemical formula.

Chemical formula of Crystal Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Chemical formula of Purpurite- MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references

Compare Yellow Gemstones

Crystal Opal Vs Dravite

Crystal Opal Vs Diaspore

Crystal Opal Vs Diopside

Crystal Opal and Purpurite Specific Gravity

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