ES2 Metamorphic Rocks - Metamorphic Microstructures #18
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Reaction rim #1.
Detail of a complex reaction rim or corona formed between quartz (above) and greenish-blue
sapphirine (below) as this granulite-facies rock cooled from very high temperature.
From top to bottom, the three shells of the reaction rim are orthopyroxene, cordierite
and sillimanite.
Field of view is 1 mm across.
Sapphirine gneiss, Wilson Lake, Labrador.
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