Tourmaline \Tour"ma*line\, n. [F. tourmaline, cf. It. turmalina,
   tormalina, NL. turmalina, turmalinus; all fr. tournamal, a
   name given to this stone in Ceylon.] (Min.)
   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. [Written
   also turmaline .]
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   Note: Crystals of tourmaline when heated exhibit electric
         polarity (see Pyroelectric, n.). Tourmaline is also
         used in the form of a polariscope called tourmaline
         tongs.
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Turmaline \Tur"ma*line\, n. (Min.)
   See Tourmaline.
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