Cordierite

горное дело кордиерит (водный силикат алюминия, железа и магния)

Англо-русский научно-технический словарь

Cordierite

noun Etymology: French, from Pierre L. A. Cordier died 1861 French geologist a blue mineral of vitreous luster and strong dichroism that consists of a silicate of aluminum, iron, and magnesium

Merriam-Webster's Collegiate Dictionary