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Strengite: Fe+++PO4·2(H2O) Cacoxenite: (Fe+++,Al)25(PO4)17O6(OH)12·75(H2O)
Comments: Lilac colored, spear-head shape crystals of strengite to 5mm in large, open vug associated with golden fibrous cacoxenite. Location: Coon Creek, Polk Co., Arkansas, USA. Scale: Picture size 2 cm. © Tom Loomis / Dakota Matrix
Strengite: Fe+++PO4·2(H2O) Kidwellite: Na(Fe+++,Cu)9+x(PO4)6(OH)11·3(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
Strengite: Fe+++PO4·2(H2O)
Comments: Pink, bladed, stellate spray of strengite crystals on matrix. Location: Indian Mountain, Cherokee County, Alabama, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals