A protolith () is the original, unmetamorphosed rock from which a given metamorphic rock is formed.
A protolith () is the original, unmetamorphosed rock from which a given metamorphic rock is formed.
For example, the protolith of a slate is a shale or mudstone. Metamorphic rocks can be derived from any other kind of non-metamorphic rock and thus there is a wide variety of protoliths. Identifying a protolith is a major aim of metamorphic geology.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).