parent rock
Example Sentences
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Metamorphic source rocks, the rocks that experience the metamorphism, are called the parent rock or protolith, from proto– meaning first, and lithos- meaning rock.
From Textbooks • Jan. 1, 2017
As with all metamorphic rock, the parent rock texture and chemistry are major factors in determining the final outcome of the metamorphic process, including what index minerals are present.
From Textbooks • Jan. 1, 2017
Dr. Schmitz and his team concluded that the new space rock, which they named Öst 65, came from the asteroid that smashed into the same L-chondrite parent rock that littered the ancient seafloor with debris.
From New York Times • Jun. 16, 2016
These space rocks came from the same parent rock and provided evidence for the first asteroid from the collision.
From New York Times • Jun. 16, 2016
The garnets used for industrial purposes are usually found loose in detrital deposits, weathered from the parent rock, though in some important workings the rock is quarried.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" by Various
