geodil.jpg

A Geoscience Digital Image Library

199.jpg
TitleTourmaline from Minas Gerais, Brazil
DescriptionTourmaline comes in many varieties; all are complex ring-silicate minerals that contain boron. The black variety is known as schorl, and has composition near NaFe3(Al,Fe)6Si6O18(BO3)3(OH)4. This sample from Minas Gerais, Brazil, is about 8 cm tall.
LocationBrazil ▹ Minas Gerais
PhotographerMike Davis. 2001-03-20.
CollectionUniversity of North Dakota Mineralogy Collection.
Key wordstourmaline, brazil, schorl
Tech details303 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number199