Staurolite and Demantoid Physical Properties

Staurolite

Demantoid

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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

3.7-3.83.77-3.95

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

Distinct on {010}

Not Available

1.7 Mohs Hardness

7-7.56.5

2 10

1.8 Chemical Composition

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

Ca 3Fe 2(SiO 4) 3Ulrich Henn and Claudio C.

Staurolite and Demantoid Chemical Formula

While comparing Staurolite and Demantoid 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 Demantoid chemical formula.

Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
Chemical formula of Demantoid- Ca 3Fe 2(SiO 4) 3Ulrich Henn and Claudio C.

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Staurolite and Demantoid Specific Gravity

Another important criteria for qualitative analysis of gemstones is Staurolite and Demantoid Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Demantoid Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 3.77-3.95 whereas that of Demantoid is 3.77-3.95.