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Learn about Gemstones Spinel Color: red, orange, yellow, purple, blue, green, grey Hardness: 8 Refractive Index: 1.71 – 1.92 Density: 3.99 – 4.00 Chemical Composition: MgAl2O4 Crystal Structure: isometric Origins: Brazil, USA, Madagascar, Sri Lanka, Burma, Thailand, Cambodia, Afghanistan, Russia. Back

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