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Learn about Gemstones Kornerupine Color: green, yellow-green, brown, blue-green Hardness: 7 Refractive Index: 1.66 – 1.69 Density: 3.25 - 3.35 Chemical Composition: (Mg,Fe)4(Al,Fe)6(SiO4,BO4)5(O,OH)2 Crystal Structure: orthorhombic Origins: Greenland, Tanzania, Madagascar, Kenya, Sri Lanka, Burma, Australia. Back

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