Kyanite
Also spelled Cyanite, also called Disthene, silicate mineral that is formed during the regional metamorphism of clay-rich sediments. It is an indicator of deep burial of a terrain rather than high stress, as formerly thought. Kyanite occurs as elongated blades principally in gneisses and schists, and it is often accompanied by garnet, quartz, and mica. Its colour ranges from gray-green to black or blue, with blue
posted by SuddenCat @ 11:28 AM
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