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Learn about Gemstones Iolite Color: blue, violet-blue Hardness: 7 - 7.5 Refractive Index: 1.52 – 1.56 Density: 2.53 – 2.78 Chemical Composition: Mg2Al3(AlSi5O18) Crystal Structure: orthorhombic Origins: Brazil, USA, Canada, Madagascar, Sri Lanka, India, Burma. Back

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