[too r-muh-lin, -leen]
- any of a group of silicate minerals of complex composition, containing boron, aluminum, etc., usually black but having various colored, transparent varieties used as gems.
Also tour·ma·lin [too r-muh-lin] /ˈtʊər mə lɪn/, turmaline.
Origin of tourmaline
1750–60; earlier tourmalin < German Turmalin, ultimately < Sinhalese tōramalliya carnelian; see -in2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for tourmaline
The "Tourmaline's" men appeared highly delighted at our defeat.In Eastern Seas
J. J. Smith
This plate of tourmaline can be turned round by the observer.The Story of the Heavens
Robert Stawell Ball
I can't resist this tourmaline, and have carried it off with me.Chats in the Book-Room
Horace N. Pym
Rutile is much lighter, 4·2, and the streak light-brown; tourmaline is only 3·2.Getting Gold
J. C. F. Johnson
Of these minerals, beryl, garnet and tourmaline are the most abundant.The Wonder Book of Knowledge
- any of a group of hard glassy minerals of variable colour consisting of complex borosilicates of aluminium with quantities of lithium, sodium, calcium, potassium, iron, and magnesium in hexagonal crystalline form: used in optical and electrical equipment and in jewellery
C18: from German Turmalin, from Sinhalese toramalli carnelian
Word Origin and History for tourmaline
complete silicate of aluminum and boron, 1759, ultimately from Sinhalese toramalli, a general name for cornelian.
Online Etymology Dictionary, © 2010 Douglas Harper
- Any of several minerals having the general chemical formula (Na,Ca)(Mg,Fe,Al,Li)3Al6(BO3)3Si6O18(OH)4. Tourmaline occurs in many different translucent colors, usually in crystals shaped like 3-, 6-, or 9-sided prisms. It occurs in igneous and metamorphic rocks, especially in pegmatites.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.