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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

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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

In many cases, however, the early history of a metamorphic rock can be deciphered.

From The Elements of Geology by Norton, William Harmon