metamorphic rock

Rock that was once one form of rock but has changed to another under the influence of heat, pressure , or some other agent without passing through a liquid phase.

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Notes

Examples are marble, which can be formed from limestone , and slate, which is formed from shale .

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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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