noun
andalusite
A mineral, an aluminum silicate, used in refractory materials and as a gemstone. Domain-specific term.
紅柱石は耐火物の原料として利用される。
Andalusite is used as a raw material for refractories.
The kanji 紅柱石 literally means 'red pillar stone', describing the mineral's typical color and crystal habit. The reading こうちゅうせき is the on'yomi of these characters.