tourmaline
Etymology
From French tourmaline, ultimately from Sinhalese තෝරමල්ලී (tōramallī, “carnelian”)
noun
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(mineralogy) A complex black or dark-coloured borosilicate mineral, compounded with various chemical elements and considered a semi-precious stone. Although there are dozens of different types of gems, among the best known and most important are […] . (Common gem materials not addressed in this article include amber, amethyst, chalcedony, garnet, lazurite, malachite, opals, peridot, rhodonite, spinel, tourmaline, turquoise and zircon.) 2012-03, Lee A. Groat, “Gemstones”, in American Scientist, volume 100, number 2, archived from the original on 2012-06-14, page 128 -
A transparent gemstone cut from it.
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