Amygdaloidal bodies containing quartz and calcite occur in a band of rock composed of K-feldspar (70 percent) and diopside (15 percent) within Lewisian (Precambrian) metasedimentary rocks of Tiree (Inner Hebrides, Scotland). The unstrained character of the quartz and other features suggest that development of the amygdaloidal texture took place after the main metamorphism of the Lewisian rocks.

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