metamorphic rock

Cultural  

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

Example Sentences

But which sedimentary rock is that metamorphic rock derived from, hmm?

From Slate • Jan. 12, 2024

It’s a metamorphic rock, which means it becomes something new under extreme heat and pressure without melting.

From National Geographic • Oct. 12, 2023

Searching for that eclogite metamorphic rock, and listening to Coltrane as you turn the bend.

From Los Angeles Times • Nov. 4, 2022

The person with knowledge of the matter said that the group’s name derived from the metamorphic rock, signaling the group’s intent to be enduring and maintain a clarity of purpose.

From New York Times • Aug. 22, 2022

This is a process which is now fully recognised as having been a potent factor in the production of the metamorphic rock, and has been called by more recent writers "dynamo-metamorphism."

From Volcanic Islands by Darwin, Charles