Spinel and Petalite Physical Properties

Spinel

Petalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

none

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.64-3.662.40

1 7.18

1.5 Fracture

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

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

1.6 Cleavage

None, but may exhibit slight parting

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

1.7 Mohs Hardness

86-6.5

2 10

1.8 Chemical Composition

MgAl₂O₄

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

Spinel and Petalite Chemical Formula

While comparing Spinel 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 Spinel and Petalite chemical formula.

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

Compare Gems for Scorpio

Spinel Vs Charoite

Spinel Vs Ametrine

Spinel Vs Azurmalachite

Spinel and Petalite Specific Gravity

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