A giant rock crystal (1 100 kg) from the Goiabeira mine in the state of Minas Gerais; the Deleff Collection – Giant Crystals, National Museum of Natural History, Paris.

Giant quartz unque minerals

A giant rock crystal (1 100 kg) from the Goiabeira mine in the state of Minas Gerais; the Deleff Collection – Giant Crystals, National Museum of Natural History, Paris.