Purpurite and Petalite Physical Properties

Purpurite

Petalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.42.40

1 7.18

1.5 Fracture

Uneven, UnevenArthur Thomas, Gemstones (2009), Brittle

Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal

1.6 Cleavage

[100] [001] perfect

Perfect on {001}, poor on {201} with 38.5° angle between the two

1.7 Mohs Hardness

4-4.56-6.5

2 10

1.8 Chemical Composition

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

LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Purpurite and Petalite Chemical Formula

While comparing Purpurite and Petalite 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 Purpurite and Petalite chemical formula.

Chemical formula of Purpurite- MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Compare Violet Gemstones

Purpurite Vs Sapphire

Purpurite Vs Sard

Purpurite Vs Sardonyx

Purpurite and Petalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Purpurite and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Purpurite and Petalite Optical Properties during the identification of gemstone. Specific gravity of Purpurite is 2.40 whereas that of Petalite is 2.40.