This month's birthstone

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Tanzanite
Color:blue, violet blue, green, yellow, brownish
Hardness:6.5 - 7
Refractive Index:1.69 – 1.70
Density:3.35
Chemical Composition:Ca2Al3(O/OH/SiO4/Si2O7)
Crystal Structure:orthorhombic
Origins:Tanzania

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