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Tourmaline is a crystalline boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Tourmaline is classified as a semi-precious stone and the gemstone comes in a wide variety of colors.

System: Trigonal
Hardness: 7

Marvelous Multi-colors Tourmaline From Sapo Mine, Ferruginha, Conselheiro Pena, Doce valley, Minas Gerais, Brazil

Photo Credit: Am Mizunaka FMF

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