硬砂岩 yìngshāyán graywacke Definitions Defs Origin Strokes Stroke Words Sentences Sents 硬砂岩 yìngshāyán graywacke a type of dark, hard sandstone typically containing poorly sorted grains of quartz and feldspar
硬砂岩 yìngshāyán graywacke a type of dark, hard sandstone typically containing poorly sorted grains of quartz and feldspar
