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| View Original: | Chalcedon 1.jpg (2104x1844) | |||
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| Courtesy of: | commons.wikimedia.org | More Like This | ||
| Keywords: Chalcedon 1.jpg Mineral chalcedone chemical composition SiO<sub>2</sub> from collection of National Museum Prague originally from Czech Republic Minerál chalcedon ze sbírek Národního muzea původem z Čech own Karelj 2008-04-20 Chalcedony Geological and mineralogical Exhibition NM Prague | ||||
