Kyanite
Kyanite yog lub ntuj refractory raw khoom ntxhia nrog siab refractoriness thiab loj ntim expansion ntawm qhov kub thiab txias. Muaj cov kab txaij sib luag ntawm lub dav hlau siv lead ua. Cov xim yog lub teeb xiav los yog cyan, ci grey thiab dawb. belongs rau high alumina minerals.