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It has a hardness of 8 on the Mohs hardness scale
where copper contributes to blue tones and iron introduces green variations
It is believed by some to improve memory and increase analytical skills
and it is known to have been widely used in Aztec and Native American cultures
its variations seem to depict landscapes and other images
Blue Kyanite 5x10-20mm Top Drill Teeth - 15-16 Inch Sage It has a hardness ofKyanite 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