The reaction rim constituted by amphibole and / or biotite is commonly observed.
2.
Halo-like " reaction rims " surround specimens; adjacent specimens deform as if to avoid entering their neighbour's halo, suggesting they competed with one another.
3.
Eclogite that is brought to shallow conditions is unstable, and retrograde metamorphism often occurs : secondary amphibole and plagioclase may form reaction rims on the primary pyroxene or garnet, and titanite may form rims about rutile.
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