Crystal: Tourmaline Chemical Composition: NaFe3(Al,Fe)6Si6O18(BO3)3(OH)4 Detail: Black Tourmaline, also known as Schorl is a complex sodium iron aluminium boro-silicate hydroxide in the Tourmaline group. Origin: Brazil, Madagascar, Afghanistan
Crystal: Tourmaline Chemical Composition: NaFe3(Al,Fe)6Si6O18(BO3)3(OH)4 Detail: Black Tourmaline, also known as Schorl is a complex sodium iron aluminium boro-silicate hydroxide in the Tourmaline group. Origin: Brazil, Madagascar, Afghanistan