greywackeWiktionary 原文英/ˈɡreɪ.wak.ə/美词源说明Anglicised form of grauwacke.释义名词noun1(geology) A hard dark sandstone with poorly sorted angular grains of quartz, feldspar, and small rock fragments in a compact, clay-fine matrix.同族词派生词 3metagreywacke·metagraywacke·subgreywacke