Petalite and Riebeckite Physical Properties

Petalite

Riebeckite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.403.28-3.44

1 7.18

1.5 Fracture

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

Uneven, Splintery, Brittle

1.6 Cleavage

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

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

1.7 Mohs Hardness

6-6.55.0-6.0

2 10

1.8 Chemical Composition

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

Not Available

Petalite and Riebeckite Chemical Formula

While comparing Petalite and Riebeckite 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 Petalite and Riebeckite chemical formula.

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

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Petalite Vs Sapphire

Petalite Vs Scolecite

Petalite Vs Scheelite

Petalite and Riebeckite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Petalite and Riebeckite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Petalite and Riebeckite Optical Properties during the identification of gemstone. Specific gravity of Petalite is 3.28-3.44 whereas that of Riebeckite is 3.28-3.44.