a very hard, piezoelectric, rhombohedral mineral, (Na,Ca)(Mg,Fe,Al,Li)Al(BO)(SiO)(OH), of various colors, used as a gem and in making pressure gauges
Origin of tourmalineFr, ultimately ; from Sinhalese t?ramalli, carnelian
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.
Origin of tourmalineFrench, from Sinhalese toramalli, carnelian.
Either directly from Sinhalese tÃ³ramalli 'carnelian', or via a cognate: German Turmalin, Portuguese tormalina, or French tourmaline