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Guimaraesite: Ca2(Zn,Mg,Fe)5Be4(PO4)6(OH)4·6H2O
Comments: Brown guimaraesite spheres and crystal aggregates.. Location: Piaui district, Itinga, Minas Gerais, Brazil. Scale: Specimen size 2 mm. © Diederik Visser
Comments: Botryoidal guimaraesite on eosphorite. Location: Piaul District, Itinga, Minas Gerais, Brazil. Scale: Specimen size 1.1 x 0.9 x 0.8 cm. © Rob Lavinsky