phosphosiderite
/ˌfɒsfə(ʊ)ˈsʌɪdərʌɪt/Mineralogy
noun
A mineral of the monoclinic crystal system which consists of hydrated ferric phosphate, FePO4.2H2O, is dimorphous with strengite, and occurs as purple, red, or yellow tabular or prismatic crystals.
Origin
Late 19th century; earliest use found in American Journal of Science. From phospho- + siderite, after German Phosphosiderit.