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Petalite
Petalite

Simpsonite
Simpsonite



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Petalite
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Simpsonite

Petalite and Simpsonite Physical Properties

Physical Properties

Tenacity

Brittle
-

Solubility

insoluble
-

Durability

-
-

Specific Gravity

2.40-9999
1 7.18
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Fracture

Subconchoidal, ConchoidalWalter Schumann, Conchoidal
Conchoidal

Cleavage

Perfect on {001}, poor on {201} with 38.5° angle between the two
None

Mohs Hardness

6-6.57-7.5
2 10
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Chemical Composition

LiAlSi 4O 10Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
Al 4(Ta,Nb) 3(O,OH,F) 14Ulrich Henn and Claudio C.

Petalite and Simpsonite Chemical Formula

While comparing Petalite and Simpsonite 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 Simpsonite chemical formula.

  • Chemical formula of Petalite- LiAlSi 4O 10Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
  • Chemical formula of Simpsonite- Al 4(Ta,Nb) 3(O,OH,F) 14Ulrich Henn and Claudio C.

Petalite and Simpsonite Specific Gravity

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