Riebeckite and Petalite Physical Properties

Riebeckite

Petalite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.28-3.442.40

1 7.18

1.5 Fracture

Uneven, Splintery, Brittle

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

1.6 Cleavage

Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}

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

1.7 Mohs Hardness

5.0-6.06-6.5

2 10

1.8 Chemical Composition

Not Available

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

Riebeckite and Petalite Chemical Formula

While comparing Riebeckite 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 Riebeckite and Petalite chemical formula.

Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Riebeckite and Petalite Specific Gravity

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