Wordnet angielsko-polski 
                        (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) 
turmalin 
Otwarty słownik angielsko-polski V.9.2007, Copyright (c) Jerzy Kazojć - 2007 r.
                        turmalin
Słownik środowiska angielsko-polski 
                        turmalin m geol.