where it continues to be mined
The two most popular classes of Australian Opal are Black Opal mined in Lightning Ridge and Fire Opal
Yellow Opal does not display the changeable flash of internal luster that other opals are known for
Garnet is used today not only as an ornamental gem
Kyanite Multi 8mm Round - 15-16 Inch Size_5x8m where it continues to beKyanite 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