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Kidwellite: Na(Fe+++,Cu)9+x(PO4)6(OH)11·3(H2O) Strengite: Fe+++PO4·2(H2O)
Comments: Spherical, crystalline aggregate of purple strengite on green kidwellite. Location: Three Oak Gap, Polk Co., Arkansas, USA. Scale: Crystal size 2 mm. © Tom Loomis / Dakota Matrix
Kidwellite: Na(Fe+++,Cu)9+x(PO4)6(OH)11·3(H2O) Frondelite: Mn++Fe+++4(PO4)3(OH)5
Comments: Root beer colored crystals of frondelite and white kidwellite sticks on matrix. Location: Sapucaia, Minas Gerais, Brazil. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Kidwellite: Na(Fe+++,Cu)9+x(PO4)6(OH)11·3(H2O)
Comments: Yellowish green columnar aggregates of kidwellite crystals. Location: Indian Mountain, Cherokee County, Alabama, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals