HUREAULITE, JOCA MINE, GALILEA, MINAS GERAIS, BRAZIL (miniature)

Hureaulite is a rare manganese phosphate characterized by the chemical formula Mn2+5(PO3OH)2(PO4)2·4H2O. It was first identified in 1825 and subsequently named in 1826 after its type locality, Les Hureaux, located in Saint-Sylvestre, Haute-Vienne, Limousin, France. While it may occasionally be referred to as huréaulite, the International Mineralogical Association advises against this spelling in English texts.

A complete mineral series ranges from lithiophilite, LiMn2+PO4, to triphylite, LiFe2+PO4, encompassing hureaulite, strengite, FePO4·2H2O, stewartite, Mn2+Fe3+2(OH,PO4)2·8H2O, and sicklerite, (LiMn2+,Fe3+)PO4.