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The Australian National University
Research School of Earth Sciences
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2008 Annual Report

Microphotograph (X Nicols) of an olivine xenocrist embedded in a diorite matrix consisting of plagioclase, clinopyroxene, amphibole, biotite and quartz. The olivine grain is surrounded by a small corona of orthopyroxene. The change in interference colors from core to rim is related with an increase in fayalite component in olivine.
Image - Jörg Hermann