hornstone是什么意思？

hornstone

英['hɔ:nstəʊn] 美['hɔnˌstoʊn]

• n. 角石；

例句

• Dongfengshan gold deposit is occurred in hornstone of Dongfengshan group under iron bearing stratum. 东风山金矿体赋存在含铁层之下的东风山群角岩层中.

英英词典释义

• Noun
  1. a fine-grained metamorphic rock formed by the action of heat on clay rocks