noun
cordierite
A magnesium iron aluminium cyclosilicate mineral, often used as a gemstone (iolite) or in ceramics.
菫青石は、熱膨張率が低いため、耐熱材料として利用される。
Cordierite is used as a heat-resistant material because of its low thermal expansion coefficient.
宝石としての菫青石はアイオライトとも呼ばれる。
Cordierite as a gemstone is also called iolite.