Purpurite and Andalusite Physical Properties

Purpurite

Andalusite

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1 Physical Properties

1.1 Tenacity

Not Available

1.3 Solubility

Not Available

1.5 Durability

Not Available

1.7 Specific Gravity

3.2-3.43.05-3.21

1 7.18

1.11 Fracture

Uneven, UnevenArthur Thomas, Gemstones (2009), Brittle

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

1.13 Cleavage

[100] [001] perfect

Good on {110}, poor on {100}

1.14 Mohs Hardness

4-4.57.5

2 10

1.16 Chemical Composition

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

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Purpurite and Andalusite Chemical Formula

While comparing Purpurite and Andalusite 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 Andalusite chemical formula.

Chemical formula of Purpurite- MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Purpurite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Purpurite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Purpurite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Purpurite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.