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Goethite: Fe+++O(OH)
Comments: Stellate crystalline aggregates of acicular goethite crystals. Location: Pribram, Bohemia, Czech Republic. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Goethite: Fe+++O(OH) Laubmannite: Fe++3Fe+++6(PO4)4(OH)12
Comments: Reddish brown goethite hosting radiating sprays of olive green laubmannite to 3 cm across. Location: Buckeye Mountain, Polk County, Arkansas, USA. Scale: 10.5 x 7.5 cm. © John Veevaert