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inclusions of Goethite or Hematite refract the light between the layers of the crystal
It has a hardness of 8 on the Mohs hardness scale
but will not be chemically treated or altered
Dakota Stones Cuprite ranges from pale to deep blue-green
Blue Kyanite 5x10-20mm Top Drill Teeth - 15-16 Inch Sage inclusions of Goethite or HematiteKyanite 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
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