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Definition of: tourmaline
Our photo definition of tourmaline 
(t
r′mə·lēn, -lin) noun
A complex borosilicate of aluminum, with a vitreous to resinous luster and found commonly black or brownish or bluish–black, but sometimes blue, green, red, or colorless. The transparent variety, when cut, is esteemed as a gemstone. Also spelled turmaline. Also tour′ma·lin (-lin). [<F, ult. <Singhalese tōramalli carnelian]
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