Hureaulite
Hureaulite is a manganese phosphate with the formula. It was discovered in 1825 and named in 1826 for the type locality, Les Hureaux, Saint-Sylvestre, Haute-Vienne, Limousin, France. It is sometimes written as huréaulite, but the IMA does not recommend this for English language text.
A complete series exists from lithiophilite, to triphylite,, including hureaulite, strengite,, stewartite,, and sicklerite,.
Environment
Hureaulite is a secondary mineral occurring in granite pegmatites. At the Type [locality (geology)|type locality] it occurs in a zone of altered triphylite,, in pegmatite. Typically occurs very late in the sequence of formation of secondary phosphate minerals. Associated at the type locality with vivianite, ; rockbridgeite, ; heterosite, and cacoxenite,. It can be synthesised; most natural hureaulites are Mn-rich compounds but extensive solution is known for synthetic material.
Localities
The type locality is Les Hureaux, Saint-Sylvestre, Haute-Vienne, Limousin, France. Hureaulite is also found in a granite pegmatite known for its phosphates in the Aimorés pegmatite district, at the Cigana claim in Galiléia, Doce valley, Minas Gerais, Brazil, formerly known as the Jocão Mine.