English: :Locality: María Josefa Mine, El Madroñal, Rodalquilar, Andalusia, Spain
Size: 3.6 × 3.4 × 2.2 cm
Description: In this specimen we have different arsenates. Colorless cubic crystals are natropharmacoalumite, accompanied by yellowish natropharmacosiderite. In some crystals you can observe a yellowish crystal core with colorless external part of both species. Small lemon yellow crytals has been identified as pharmacoalumite. The name of natropharmacoalumite is in allusion to the cation dominance of Na and Al.
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