Tourmaline Crystals

Tourmaline crystals
Tourmaline Crystals. Sapo Mine, Ferruginha, Conselheiro Pena, Doce Valley, Minas Gerais, Brazil
Credit: Heritage Auctions

Tourmalines are boron silicate minerals that get their rainbow-like colors from various elements such as iron, sodium or magnesium. Tourmaline is classified as a semi-precious stone and the gemstone comes in a wide variety of colors.

System: Trigonal
Hardness: 7

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