... be founded in the igneous rock, granitic pegmatite and metamorphic limestone. Some transparent and beautiful spinel can be used as precious stones ... They have varied colors, colorless, pink, red, purple, light purple, deep blue, blue, yellow, and brown and so on. Spinel is divided ... ; there is red, orange, blue-violet, blue spinel and so on. Pink and red spinel aglow red fluorescence when in the long ...