Piauí valley, Taquaral, Itinga, Jequitinhonha valley, Minas Gerais, Brazil
Articlecode:
VII.D.0153.001
Guimarãesite occurs in the granite pegmatite near the Piauí river, Itinga, Minas Gerais. It is a newly recognized Zn-dominat member of the roscherite- and approved in 2006 by the International Mineralogy Association (IMA) as a valid species.