hornstone
hornstone
(ˈhɔːnˌstəʊn)| Noun | 1. | hornstone - a fine-grained metamorphic rock formed by the action of heat on clay rocks |
| 单词 | hornstone | |||
| 释义 | hornstonehornstone(ˈhɔːnˌstəʊn)
Hornstonehornstone[′hȯrn‚stōn]Hornstone(hornstein), siliceous rocks (flints, jaspers, menilites) with admixtures of clay material and iron hydroxides; they form concretions and intercalations in carbonate and clay beds. Hornstones often contain carbonates and organic remnants, such as sponges and radiolarians. hornstone
Synonyms for hornstone
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