Staurolite and Caledonite Physical Properties

Staurolite

Caledonite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.7-3.85.6-5.76

1 7.18

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Fracture

Subconchoidal, Conchoidal

Uneven

Cleavage

Distinct on {010}

[001] perfect; [100] distinct

Mohs Hardness

7-7.52.5-3

2 10

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Chemical Composition

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

Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)

Staurolite and Caledonite Chemical Formula

While comparing Staurolite and Caledonite 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 Caledonite chemical formula.

Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
Chemical formula of Caledonite- Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)

Compare Brown Gemstones

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Staurolite Vs Kutnohorite

Staurolite Vs Mottramite

Staurolite and Caledonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Staurolite and Caledonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Caledonite Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 5.6-5.76 whereas that of Caledonite is 5.6-5.76.