Kidwellite : NaFe3+9+x(PO4)6(OH)11·3H2O, x = 0.33
As recorded:
Three Oaks Gap workings, Three Oak Gap, Polk County, Arkansas, USA
Photo added to mindat.org
“0.89 mm green Kidwellite ball. Collection Domenico Preite photo Matteo Chinellato”
Matteo Chinellato - 9th June 2011
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