Kyanite 2-3x3-4mm Faceted Rondelle - 15-16 Inch 20210806 and much of the black

and much of the black Onyx on the market has been artificially colored

A relatively rare silicate mineral found in igneous and metamorphic rocks around the world

tourmaline and other minerals

metamorphic

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Kyanite 2-3x3-4mm Faceted Rondelle - 15-16 Inch 20210806 and much of the 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