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Augelite and Goethite Physical Properties


Goethite and Augelite Physical Properties


Physical Properties

Tenacity
-  
-  

Solubility
-  
HCl soluble  

Durability
-  
-  

Specific Gravity
2.70-2.75  
4.27-4.29  

Fracture
Conchoidal  
Uneven  

Cleavage
From the Greek for luster, for its pearly luster on the cleavage.  
Perfect {010}  

Mohs Hardness
4.5-5  
5-5.5  

Chemical Composition
Al 2(PO 4)(OH) 3Michael O’Donoghue , Gems, Sixth Edition (2006)  
FeO(OH)Arthur Thomas , Gemstones (2009)  

Optical Properties >>
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Augelite and Goethite Chemical Formula

While comparing Augelite and Goethite 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 Augelite and Goethite chemical formula.

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Augelite and Goethite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Augelite and Goethite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Augelite and Goethite Optical Properties during the identification of gemstone. Specific gravity of Augelite is 4.27-4.29 whereas that of Goethite is 4.27-4.29.

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