Staurolite and Moldavite Physical Properties

Staurolite

Moldavite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.7-3.82.32-2.38

1 7.18

1.5 Fracture

Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

Distinct on {010}

Not Available

1.7 Mohs Hardness

7-7.55.5

2 10

1.8 Chemical Composition

(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.

SiO 2(+Al 2O 3)Walter Schumann , Gemstones of the world (2001)

Staurolite and Moldavite Chemical Formula

While comparing Staurolite and Moldavite 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 Staurolite and Moldavite chemical formula.

Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
Chemical formula of Moldavite- SiO 2(+Al 2O 3)Walter Schumann , Gemstones of the world (2001)

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Staurolite and Moldavite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Staurolite and Moldavite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Moldavite Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 2.32-2.38 whereas that of Moldavite is 2.32-2.38.