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graywacke ['greiwæk] n
gen.	硬砾岩
desert.	杂砂岩 (指由棱角状石英(和燧石)颗粒以及丰富的变质岩屑组成的砂岩，几乎无胶结物和长石，含有12%〜17%以上的云母和绿泥石)
earth.sc.	杂砂岩硬砂岩
geol.	杂【硬】砂岩; 硬【杂】砂岩
met.	灰瓦克; 杂砂岩
oil	硬砂岩
tech.	玄武土; 灰瓦岩; 杂色砂岩; 灰色杂砂岩

graywacke: 23 phrases in 3 subjects

Earth sciences	1
Oil / petroleum	5
Technology	17