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n. A complex crystalline silicate containing aluminum, boron, and other elements, used in electronic instrumentation and, especially in its green, clear, and blue varieties, as a gemstone.

n. A complex black or dark coloured borosilicate mineral.

n. A transparent gemstone cut from it.

n. A mineral occurring usually in three-sided or six-sided prisms terminated by rhombohedral or scalenohedral planes. Black tourmaline (schorl) is the most common variety, but there are also other varieties, as the blue (indicolite), red (rubellite), also green, brown, and white. The red and green varieties when transparent are valued as jewels.

n. a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones

"Manufacturers have added static-reducing technology and replaced traditional wire heating coils with ceramic heating elements; many also have added a gemstone called tourmaline to the internal works — all of which, they claim, help today's dryers work faster and cause less damage than older models."

mineral    transparent gem   

turmaline   

schorl   

chalcedony    chrysolite    garnet    topaz    carbuncle    lazuli    malachite    Muscovite    moonstone    jasper