Staurolite and Ruby Physical Properties

Staurolite

Ruby

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.7-3.83.97-4.05

1 7.18

1.5 Fracture

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

Conchoidal

1.6 Cleavage

Distinct on {010}

No true cleavage

1.7 Mohs Hardness

7-7.59

2 10

1.8 Chemical Composition

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

Al ₂ O ₃

Staurolite and Ruby Chemical Formula

While comparing Staurolite and Ruby 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 Ruby chemical formula.

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

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Staurolite and Ruby Specific Gravity

Another important criteria for qualitative analysis of gemstones is Staurolite and Ruby Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Ruby Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 3.97-4.05 whereas that of Ruby is 3.97-4.05.