粘板岩 niánbǎnyán slate Definitions Defs Origin Strokes Stroke Words Sentences Sents 粘板岩 niánbǎnyán slate A type of hard, fine-grained rock formed from mudstone or shale under heat and pressure, typically grayish-black and easily split into thin layers; slate or argillite
粘板岩 niánbǎnyán slate A type of hard, fine-grained rock formed from mudstone or shale under heat and pressure, typically grayish-black and easily split into thin layers; slate or argillite
