Petalite and Spinel Physical Properties

Petalite

Spinel

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

insoluble

none

1.3 Durability

Not Available

1.4 Specific Gravity

2.403.64-3.66

1 7.18

1.5 Fracture

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

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

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

None, but may exhibit slight parting

1.7 Mohs Hardness

6-6.58

2 10

1.8 Chemical Composition

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

MgAl₂O₄

Petalite and Spinel Chemical Formula

While comparing Petalite and Spinel 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 Spinel chemical formula.

Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Spinel- MgAl₂O₄

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Petalite Vs Sapphire

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Petalite Vs Scheelite

Petalite and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Petalite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Petalite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Petalite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.