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Staurolite and Opal Physical Properties


Opal and Staurolite Physical Properties


Physical Properties

Tenacity
Brittle   
BrittleWalter Schumann   

Solubility
Not Available   
hot salt water   

Durability
Not Available   
Not Available   

Specific Gravity
3.7-3.8   
1.98-2.25   

Fracture
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle   
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle   

Cleavage
Distinct on {010}   
None   

Mohs Hardness
7-7.5   
5-6.5   

Chemical Composition
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.   
SiO2 · nH2O   

Optical Properties >>
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Staurolite and Opal Chemical Formula

While comparing Staurolite and Opal 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 Opal chemical formula.

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Staurolite and Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Staurolite and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Opal Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 1.98-2.25 whereas that of Opal is 1.98-2.25.

Brown Gemstones

Brown Gemstones


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