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they appear dark or black
abbreviated as CZ
No one knows what’s in the solution because this is a proprietary and guarded process
When this combination crystallized
Blue Kyanite 10mm Round - 15-16 Inch nye_8inch_best they appear dark or blackKyanite often occurs as long, bladed, striated crystals, transparent or translucent with a pearly luster. An aluminum silicate mineral, it may appear in white, pink, yellow, orange, green, blue, gray and black. In addition to its value as a gemstone, Kyanite is also extremely useful in industrial applications due to its high heat resistance. It is often used in kiln furniture and foundry molds, as well as for brake shoes, grinding wheels and cutting