Images
Formula: Na2Fe3+4(AsO4)3(OH)5.7H2O
Hydrated arsenate,
pharmacosiderite group,
pharmacosiderite supergroup, forms a series with
pharmacosiderite
Specific gravity: 2.79 measured, 2.9 calculated
Crystal system: Isometric
Hardness: 3
Colour: Light green, dull orange; pale green in transmitted light
Environments
Localities
At the type locality, the Marda oxidised zone, Marda Project, Mount Jackson Goldfield, Yilgarn Shire, Western
Australia, natropharmacosiderite occurs as clusters of randomly oriented crystals. Individual crystals are
pale green, euhedral cubes without modifying forms, to 0.5 mm in size. Associated minerals include
arseniosiderite,
arsenopyrite, jarosite,
pharmacosiderite, quartz
and scorodite
(Mindat).
At the María Josefa Mine, Rodalquilar, Níjar, Almería, Andalusia, Spain, natropharmacosiderite has been
found
(Mindat photo).
Natropharmacosiderite from the María Josefa
Mine - Image
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