Herderite

Herderite is a phosphate mineral belonging to the apatite group, with formula CaBe(PO4)(F,OH). It forms monoclinic and variable in colour from colourless through yellow to green. It forms a series with the more common hydroxylherderite , which has more hydroxyl ion

It is found in many parts of the world, often in pegmatites and associated with other apatite minerals.

It was first described in 1828 for an occurrence in the Sauberg Mine, Erzgebirge, Germany. It was named for Saxon mining official Sigmund August Wolfgang von Herder (1776–1838).