Green Kyanite 6-8x12-25mm Drop - 15-16 Inch Druse and it has been used

and it has been used throughout history for various purposes

Hackmanite is the light pink to pale violet variety of sodalite

Natural Turquoise may be cut and polished

In any case

Topaz occurs in a wide range of natural colors

Green Kyanite 6-8x12-25mm Drop - 15-16 Inch Druse and it has been usedKyanite 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