Sunstone and Petalite Physical Properties

Sunstone

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

2.62-2.652.40

1 7.18

1.5 Fracture

Gemstones of the world (2001)

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

1.6 Cleavage

001

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

1.7 Mohs Hardness

66-6.5

2 10

1.8 Chemical Composition

Microcline: KAlSi₃O₈ Oligoclase: (Na,Ca)Al_1-2Si_3-2O₈

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

Sunstone and Petalite Chemical Formula

While comparing Sunstone 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 Sunstone and Petalite chemical formula.

Chemical formula of Sunstone- Microcline: KAlSi₃O₈ Oligoclase: (Na,Ca)Al_1-2Si_3-2O₈
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Sunstone and Petalite Specific Gravity

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