DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Olivine inclusion in basalt. Polarised light micrograph of a section through a rock containing basalt (grey) and crystals of peridotite (coloured). Peridotite is thought to be the most abundant mineral in the Earth's crust and mantle. It contains olivine and pyroxene. Basalt forms from magma (molten rock) that cools on the surface.
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