noun
montmorillonite
A clay mineral; the term is rare and technical, used mainly in geology and mineralogy. The synonym モンモリロナイト is more common.
See also: モンモリロナイト
モンモリロン石は火山灰が変質してできた粘土鉱物の一種である。
Montmorillonite is a type of clay mineral formed from altered volcanic ash.