noun ダウンロード 🔗共有 蛍石(ほたるいし) A widely occurring mineral (calcium fluoride), of various colours, used as a flux in steelmaking, and in the manufacture of glass, enamels and hydrofluoric acid. Examples : "Fluorite is the main natural resource of Thailand." 蛍石はタイの主要な天然資源です。 mineral material substance geology chemistry industry science AIとチャット語彙ゲーム読解練習