Micro crystals of Natropharmacoalumite have developed on a Quartz-Fe oxide matrix within small cavities. The mineral forms transparent colourless to pale yellow intergrowing cubic crystals. Areas on the specimen are invested with minor white Kaolinite. This rare member of the Pharmacosiderite group was described by Rumsey et al (2010), who recorded that the specimens were collected from a single Fe-rich silicified boulder.