Spinel stone is a family of minerals, in nature, formed in the molten magma intrusion into the impure limestone or dolomite formed by contact metamorphism. Some spinel stone are in Al-rich magmatic rocks. The best spinel mainly means a magnesium-aluminum spinel. The crystal shape is combination of Octahedral crystal and the octahedral to rhombic dodecahedron. Rich colors, a colorless, pink, red, purple, light purple, blue, purple, blue, yellow, brown and so on. Spinel stone species is devided by the color, such as red, orange, violet, blue spinel.
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