Staurolite and Nuummite Physical Properties

Staurolite

Nuummite

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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

3.7-3.83.18-3.37

1 7.18

1.5 Fracture

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

Conchoidal

1.6 Cleavage

Distinct on {010}

Perfect on 210

1.7 Mohs Hardness

7-7.55.5-6

2 10

1.8 Chemical Composition

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

Not Available

Staurolite and Nuummite Chemical Formula

While comparing Staurolite and Nuummite 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 Nuummite chemical formula.

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

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Staurolite and Nuummite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Staurolite and Nuummite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Nuummite Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 3.18-3.37 whereas that of Nuummite is 3.18-3.37.