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Opal (Var: Quinzite Opal) : SiO2·nH2O | |
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Quincy-sur-Cher, Bourges, Cher, Centre, France Sample size: 11 X 8 cm Collection and photo:Arliguie M |
| © Arliguie M | Photo ID: 197115 View Count: 135 |
Sepiolite : Mg4Si6O15(OH)2·6H2O | |
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Quincy-sur-Cher, Bourges, Cher, Centre, France Field of view 8 mm. Collection M. Kampf No 69-037. |
| © 2005 M. Kampf | Photo ID: 33819 View Count: 1208 |
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