English Dictionary

alum slate

名詞

(geology) A slate consisting mainly of clay, iron pyrites, and coaly matter, from which alum is obtained.

日本語の意味

(地質学) 粘土、黄鉄鉱、煤質物質を主成分とする石板で、そこから明礬が採取される石板。

The geologist identified a layer of alum slate that explained the unusual alum deposits nearby.

地質学者は、近くに見られる異常な明礬の堆積を説明する、明礬を含む頁岩の層を特定した。

意味（1）

(geology) A slate consisting mainly of clay, iron pyrites, and coaly matter, from which alum is obtained.