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More Indepth notes on Metals
Source: Bibliography
Geological Rocks & Minerals 
Designed by Nigel G Wilcox
Ref: O2
Rocks & Minerals Index
Photographs Courtesy :Calvin J Hamilton
Non-Commercial Reseach Identification
Non-Commercial Reseach Identification
Non-Commercial Reseach Identification
Opal
Name: Opal
Location: Virgin Valley, Nevada
Date: 2010
Composition: SiO2.nH2O 
Name: Opal
Location: Clover Creek, Idaho
Date: 2010
Composition: SiO2.nH2O 
Name: The Dark Jubilee Opal
Location: Coober  Pedy, Australia
Date: 2009
Caption: 318.4 Carats
Composition: SiO2.nH2O 
Copyright   All Rights Reserved  by Nigel G Wilcox         E-Mail: ngwilcox100@gmail.com
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