Tags: Chemical Substance, Mineral.
Greifensteinite is beryllium phosphate mineral with formula: Ca2Fe2+5Be4(PO4)6(OH)4·6H2O. It is the Fe2+ dominant member of the roscherite group. It crystallizes in the monoclinic crystal system and typically forms prismatic dark olive green crystals.It was first described in Germany at Greifenstein Rocks Ehrenfriedersdorf and was named for the location. At the type locality it occurs within a lithium-rich pegmatite in miarolitic cavities.
