_:b1217536 "Wikipedia:Shale"^^ . _:b1217536 . _:b1217536 "A fine-grained sedimentary rock whose original constituents were clays or muds. It is characterized by thin laminae breaking with an irregular curving fracture, often splintery and usually parallel to the often-indistinguishable bedding plane."^^ . _:b1217536 . _:b1217536 .