Gahnospinel and Petalite Physical Properties

Gahnospinel

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

3.65-4.552.40

1 7.18

1.5 Fracture

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

7.5-86-6.5

2 10

1.8 Chemical Composition

(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)

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

Gahnospinel and Petalite Chemical Formula

While comparing Gahnospinel 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 Gahnospinel and Petalite chemical formula.

Chemical formula of Gahnospinel- (Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Compare Blue Gemstones

Gahnospinel Vs Indicolite Blue Tourmaline

Gahnospinel Vs Jeremejevite

Gahnospinel Vs Hydrogrossular

Gahnospinel and Petalite Specific Gravity

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