Phosphosiderite 10mmLilac purple and pink shades of colors throughout this stone with faint marbling throughout. Phosposiderite is considered rare for a few key geological reasons. It only forms under very specific conditions. Phosphosiderite is an iron phosphate mineral that forms in the oxidized zones of phosphate rich pegmatites. That means you need a phosphate source (like triphylite), iron present, and groundwater oxidation processes. This combination doesnt happen