超ちょう苦く鉄てつ質しつ岩がん

noun

ultramafic rock

Technical term in mineralogy for igneous rocks with very low silica content, rich in magnesium and iron.

• 超ちょう苦く鉄てつ質しつ岩がんはマントル由ゆ来らいの岩がん石せきとして知しられている。

  Ultramafic rocks are known as rocks derived from the mantle.