greywacke

名词 n.
中文释义
英 /ˈɡɹeɪ.wak.ə/   

英文释义

名词 n.
  1. A hard dark sandstone with poorly sorted angular grains of quartz, feldspar, and small rock fragments in a compact, clay-fine matrix. countable,uncountable
    — Endless bleak, rounded hills composed of shales and ribs of tough ‘greywackes’ make up the Southern Uplands – all of such rocks were originally deposited under marine conditions.

词形变化

greywackes plural graywacke alternative

词源

Anglicised form of grauwacke.
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