DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Graphic granite. Polarised light micrograph of a section through graphic granite. This is a type of granite in which the two components, quartz and feldspar, solidify simultaneously from magma. This results in the formation seen here, with crystals of quartz (yellow) embedded in a matrix of feldspar (grey).
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