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Tourmaline   /tˈʊrməlˌin/   Listen
Tourmaline

noun
(Written also turmaline)
1.
A mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones.





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"Tourmaline" Quotes from Famous Books



... darker coloured rocks, or in limestone country, but it sometimes occurs in gneiss, mica schist, and chlorite schist. Numerous other minerals are at times mistaken for tin, the most common of which are tourmaline or schorl, garnet, wolfram (which is a tungstate of iron with manganese), rutile or titanic acid, blackjack or zinc blende, together with magnetic, titanic, and specular iron in ...
— Getting Gold • J. C. F. Johnson


Words linked to "Tourmaline" :   schorl, mineral, transparent gem


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