Physical Properties of Tourmaline Tourmaline is a well-known semi-precious gemstone that comes in many colors and varieties, and is well regarded by crystal healer and collector alike. Its name comes from the Sinhalese word, “Turmali”. It crystallizes as long, hexagonal striated crystals, looking similar to beryl crystals, sometimes large, but may also be needle like. The colors of tourmaline ranges from colorless, to jet black, encompassing nearly all the colors of the rainbow, and there are even multi-colored tourmalines. It has a good Mohs hardness score of 7 to 7.5, which is similar to quartz.
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