Tourmaline is a crystalline boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium and can be found in a wide variety of colors. Tourmaline is a fairly durable gemstone with a hardness of 7.0-7.5 on the Mohs Hardness Scale. Tourmaline gemstones can be cut into many shapes and sizes, often as faceted gems, cabochons, polished crystal slices or mineral specimens.
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