It is extremely fracture to resistant and has been used for blades and other tools since Neolithic times
The color of Green Aventurine comes from Fushite particles within the quartz
usually in white on hues of brown
all organic parts are replaced by minerals
Green Kyanite 6-8x12-25mm Drop - 15-16 Inch latest-chips It is extremely fracture toKyanite 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