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botryoidal
and was prized in ancient times for the ultramarine dye derived from it
Howlite can be easily dyed and is often treated to be blue for use as a substitute for turquoise
People have treated turquoise for centuries using various treatment methods
Kyanite Multi 4mm Round - 15-16 Inch Australian Boulder Opal botryoidalKyanite 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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