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what are these bumps called? I got a national geographic geode kit and I found those inside the first one I opened : r/Crystals
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Amazon.com: NATIONAL GEOGRAPHIC Break Open 5 geodas gigantes, kit de ciencia de la tierra con 5 geodas extra grandes con cristales, gafas, guía de aprendizaje y soportes de exhibición, regalos de ciencia,
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Amazon.com: NATIONAL GEOGRAPHIC Break Open 10 Premium Geodes – Includes Goggles, Detailed Learning Guide & 2 Display Stands - Great STEM Science Gift for Mineralogy & Geology Enthusiasts of Any Age : Toys & Games
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