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A very large proportion of both the quartz and placer mining of North America is in regions occupied by metamorphic rock.
In many cases, however, the early history of a metamorphic rock can be deciphered.
It is a metamorphic rock derived from either sedimentary or igneous rock, more commonly the former.
According to this view, the superposition of chalk does not prevent the subjacent metamorphic rock from being Eocene.
Mī′ca-schist, Mī′ca-slate, a metamorphic rock consisting of alternate layers of mica and quartz.
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[tawr-choo-uhs ]
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