Term: protolith(n)
Literally meaning: “first-stone”
Origin: Anc Greek
πρώτος/protos(=first) > πρo/pro-(prefix denoting “in front of”, “towards”, "before")
+λίθος/(-lithos)(=stone)
Definition
Protolith is the original state of a sedimentary rock before its metamotphism.
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