JEAN-CLAUDE REVY, ISM / SCIENCE PHOTO LIBRARY JEAN-CLAUDE REVY, ISM / SCIENCE PHOTO LIBRARY
Granodiorite mineral with amphibole. Granodiorite is an intrusive igneous rock, which means that it forms from magma (molten rock) that has intruded into other rocks. As the name suggests, it is similar to granite, and like all granites is mainly silica and aluminium, with a mixture of other minerals. Here it has mixed with amphibole (black), a silicate mineral. The size of this sample is 7 by 6 centimetres.
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