tourmaline

[toor-muh-lin, -leen]
noun
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, tourmalin [toor-muh-lin] , turmaline.


Origin:
1750–60; earlier tourmalin < German Turmalin, ultimately < Sinhalese tōramalliya carnelian; see -in2

tourmalinic [toor-muh-lin-ik] , adjective
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World English Dictionary
tourmaline (ˈtʊəməˌliːn)
 
n
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]
 
tourmalinic
 
adj

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American Heritage
Science Dictionary
tourmaline   (tr'mə-lĭn, -lēn')  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Unique coastal gifts include handmade scrimshaws and jewelry featuring
  tourmaline, the state gemstone.
Tourmaline seems to have a special place in the hearts of mineral collectors as
  well as in that of gem and gemstone enthusiasts.
Tourmaline is used as a semiprecious gemstone when found in transparent
  crystals of red, pink, green or blue color.
Often the composition consists of garnet, tourmaline, and mica.
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