超苦鉄質岩 ちょうくてつしつがん Meanings Noun ultramafic rock Kanji 超 exceed. Read as チョウ. 苦 suffer 鉄 iron. Read as テツ. 質 quality. Read as シツ. 岩 rock. Read as ガン. Word lists Mineralogy Jinuma: Japanese Dictionary · Word lists