燐りん鉱こう石せき

noun

phosphorite; phosphate rock

A sedimentary rock rich in phosphate minerals, used mainly as a raw material for fertilizer production.

• 燐りん鉱こう石せきは肥ひ料りょうの原げん料りょうとして重じゅう要ようである。

  Phosphate rock is important as a raw material for fertilizer.