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A few years ago in Venezuela, parque nacional de Cainama, the tourist guide found and gave me this rocks, he told us that a geologist told him that those could be radioactive but no one believed him. Nowadays I'm very curious of what kind of rock it may be.

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    $\begingroup$ Welcome to the site. Unfortunatelly, we are no longer suporting id-my-rock questions. I can sugest you this site to ask. We wrote this guide if it helps you to ask propertly. $\endgroup$ – Universal_learner Apr 18 at 10:03