12183-80-1

gray, greenish, reddish, or bluish; hardness 7–7.5; used in dental cements and the glass industry, in enamels, ceramics, and as a paint filler [MER06] [HAW93]

It was estimated that in 1987, 90% of the kyanite produced in the United States was used in refractories, 55% of this for smelting and processing iron, 20% for smelting and processing nonferrous metals, and15% for refractories in glassmaking and ceramics.