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Quartz found in sandstone.  I always believed that these are rounded pebbles from original rivers, but I am now convinced that they are just nodules of quartz that formed in the sandstone. (Author: Pierre Joubert)

Quartz found in sandstone. I always believed that these are rounded pebbles from original rivers, but I am now convinced that they are just nodules of quartz that formed in the sandstone. (Author: Pierre Joubert)

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