ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Pegmatite. Polarised light micrograph (PLM) of a thin section through pegmatite rock. Pegmatite is an igneous rock associated with granite and syenite deposits. It mainly consists of quartz, alkaline feldspar and mica. To the unaided eye the rock has a light colour. Pegmatite is extracted due to the economic importance of the minerals it contains, such as orthoclase and beryl. Magnification: x9 at 6x7 cm size. Magnification; x15 at 4x5" size.
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