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2ème découverte d'un autre type


elockacroc77@gmail.com
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  • 1 month later...

Je ne pense pas les rognons de silex sont des concrétions de silices qui se forment dans des roches calcaires, il peuvent donc prendre toutes sortes de formes (malgré tout ils peuvent contenir de la calcédoine et des cristaux de quartz, d'autres formes de la silice).

 

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