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what is this rock?
(feddit.org)
Let us help you identify that mysterious object you’ve found.
Currently in CHALLENGE mode: If you've got something obscure knocking about, post a picture, and let's see how we do. Please prefix such posts with "CHALLENGE:" so we know we've got a fighting chance.
I'm not all that great at identification, despite having a sizeable rock collection myself, but I feel pretty confident in saying that you've got a type of mica schist. Schists often are primarily composed of mica.