Hureaulite is a

manganese Manganese is a chemical element; it has Symbol (chemistry), symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese was first isolated in the 1770s. It is a transition m ...

phosphate Phosphates are the naturally occurring form of the element phosphorus. In chemistry, a phosphate is an anion, salt, functional group or ester derived from a phosphoric acid. It most commonly means orthophosphate, a derivative of orthop ...

with the formula . It was discovered in 1825 and named in 1826 for the type locality, Les Hureaux,

Saint-Sylvestre, Haute-Vienne Saint-Sylvestre (; ) is a commune in the Haute-Vienne department in the Nouvelle-Aquitaine region in west-central France. See also * Grandmontines * Communes of the Haute-Vienne department The following is a list of the 195 communes of the ...

Limousin Limousin (; ) is a former administrative region of southwest-central France. Named after the old province of Limousin, the administrative region was founded in 1960. It comprised three departments: Corrèze, Creuse, and Haute-Vienne. On 1 Jan ...

France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...

. It is sometimes written as huréaulite, but the IMA does not recommend this for English language text.Burke, E. A. J. (2008): Tidying up Mineral Names: An IMA scheme for Suffixes, Hyphens and Diacritical Marks. Mineralogical Record, 39, 134 A complete series exists from

lithiophilite Lithiophilite is a mineral containing the element lithium. It is lithium manganese(II) phosphate with chemical formula . It occurs in pegmatites often associated with triphylite, the iron end member in a solid solution series. The mineral with in ...

, to

triphylite Triphylite is a lithium iron(II) phosphate mineral with the chemical formula LiFePO4.IMA-CNMNC List of Mine ...

, , including hureaulite, strengite, , stewartite, , and sicklerite, .Murdoch, Joseph (1943) Crystallography of Hureaulite. American Mineralogist 28: 19-24

Environment

Hureaulite is a secondary

mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. (2011): Mi ...

occurring in

granite Granite ( ) is a coarse-grained (phanerite, phaneritic) intrusive rock, intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly coo ...

pegmatites A pegmatite is an igneous rock showing a very coarse texture, with large interlocking crystals usually greater in size than and sometimes greater than . Most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic com ...

. At the type locality it occurs in a zone of altered

triphylite Triphylite is a lithium iron(II) phosphate mineral with the chemical formula LiFePO4.IMA-CNMNC List of Mine ...

, , in pegmatite. Typically occurs very late in the sequence of formation of secondary phosphate minerals.Moore, P B, and Araki, T (1973) Hureaulite: its atomic arrangement. American Mineralogist 58: 302-307. Associated at the type locality with

vivianite Vivianite () is a hydrated iron(II) phosphate mineral found in a number of geological environments. Small amounts of manganese Mn2+, magnesium Mg2+, and calcium Ca2+ may substitute for iron Fe2+ in its structure.Gaines et al (1997) Dana's New ...

, ; rockbridgeite, ; heterosite, and cacoxenite, . It can be synthesised;Gerault, Y, Riou, A, and Cudennec, Y (1987) Acta Crystallographica (C) 43:1829 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,

. Hureaulite is also found in a granite pegmatite known for its phosphates in the Aimorés pegmatite district, at the Cigana claim in

Galiléia Galileia is a municipality in the state of Minas Gerais in the Southeast region of Brazil. See also *List of municipalities in Minas Gerais This is a list of the municipalities in the States of Brazil, state of Minas Gerais, Minas Gerais (MG), ...

, Doce valley,

Minas Gerais Minas Gerais () is one of the 27 federative units of Brazil, being the fourth largest state by area and the second largest in number of inhabitants with a population of 20,539,989 according to the 2022 Brazilian census, 2022 census. Located in ...

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

, formerly known as the Jocão Mine.

References

{{Commons Manganese(II) minerals Phosphate minerals Monoclinic minerals Tetrahydrate minerals Minerals in space group 15