Strunz classification 8.DA.10 Crystal system Monoclinic | Dana classification 42.7.7.4 | |
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Category Phosphate mineral
Roscherite group Formula
(repeating unit) Ca2Fe5Be4(PO4)6(OH)4·6H2O Crystal class Prismatic (2/m)
(same H-M symbol) | ||
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.
Map of Greifensteine, 09427 Ehrenfriedersdorf, Germany
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. It was approved by the International Mineralogical Association in 2002.
References
Greifensteinite Wikipedia(Text) CC BY-SA