That's from Brazilian Amazon, more specifically a small mountain (300 m high) called "Morro dos Seis Lagos" (six lakes hill), at São Gabriel da Cachoeira municipality, Amazonas state, located at 0.283 North, 66.685 West.
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$\begingroup$ Can you add an approximate size? 2-3cm? $\endgroup$– RHAJul 21, 2018 at 19:19
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$\begingroup$ @RHA Sorry, it's been 14 long years now. But I think bigger than that, between 5 and 10 cm. $\endgroup$– RodrigoJul 21, 2018 at 19:21