Hureaulite
Encyclopedia
Hureaulite is a manganese
phosphate
with the formula Mn2+5(PO3OH)2(PO4)2·4H2O. 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
, LiMn2+PO4 to triphylite, LiFe2+PO4, including hureaulite, strengite, FePO4·2H2O, stewartite, Mn2+Fe3+2(OH,PO4)2·8H2O, and sicklerite, (LiMn2+,Fe3+)PO4.
mineral
occurring in granite
pegmatites. At the type locality
it occurs in a zone of altered triphylite, LiMn2+PO4, in pegmatite. Typically occurs very late in the sequence of formation of secondary phosphate minerals. Associated at the type locality with vivianite, Fe2+3(PO4)2·8H2O; rockbridgeite, Fe2+Fe3+4(PO4)3(OH)5; heterosite, (Fe3+,Mn3+)PO4 and cacoxenite
, Fe3+24AlO6(PO4)17(OH)12·17H2O. It can be synthesised; most natural hureaulites are Mn-rich compounds but extensive (Mn,Fe) solution is known for synthetic material.
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.
Manganese
Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a free element in nature , and in many minerals...
phosphate
Phosphate
A phosphate, an inorganic chemical, is a salt of phosphoric acid. In organic chemistry, a phosphate, or organophosphate, is an ester of phosphoric acid. Organic phosphates are important in biochemistry and biogeochemistry or ecology. Inorganic phosphates are mined to obtain phosphorus for use in...
with the formula Mn2+5(PO3OH)2(PO4)2·4H2O. It was discovered in 1825 and named in 1826 for the type locality, Les Hureaux, Saint-Sylvestre, Haute-Vienne
Saint-Sylvestre, Haute-Vienne
Saint-Sylvestre is a commune in the Haute-Vienne department in the Limousin region in west-central France.-References:*...
, Limousin
Limousin (région)
Limousin is one of the 27 regions of France. It is composed of three départements: Corrèze, Creuse and the Haute-Vienne.Situated largely in the Massif Central, as of January 1st 2008, the Limousin comprised 740,743 inhabitants on nearly 17 000 km2, making it the second least populated region of...
, France
France
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...
. It is sometimes written as huréaulite, but the IMA does not recommend this for English language text.
A complete series exists from lithiophilite
Lithiophilite
Lithiophilite is a mineral containing the element lithium. It is lithium manganese phosphate with formula: LiMnPO4. It occurs in pegmatites often associated with triphylite, the iron end member in a solid solution series...
, LiMn2+PO4 to triphylite, LiFe2+PO4, including hureaulite, strengite, FePO4·2H2O, stewartite, Mn2+Fe3+2(OH,PO4)2·8H2O, and sicklerite, (LiMn2+,Fe3+)PO4.
Environment
Hureaulite is a secondarySecondary
Secondary is an adjective meaning "second" or "second hand". It may refer to:* The group of defensive backs in American football and Canadian football* An obsolete name for the Mesozoic in geosciences...
mineral
Mineral
A mineral is a naturally occurring solid chemical substance formed through biogeochemical processes, having characteristic chemical composition, highly ordered atomic structure, and specific physical properties. By comparison, a rock is an aggregate of minerals and/or mineraloids and does not...
occurring in granite
Granite
Granite is a common and widely occurring type of intrusive, felsic, igneous rock. Granite usually has a medium- to coarse-grained texture. Occasionally some individual crystals are larger than the groundmass, in which case the texture is known as porphyritic. A granitic rock with a porphyritic...
pegmatites. At the type locality
Type locality (geology)
Type locality , also called type area or type locale, is the where a particular rock type, stratigraphic unit, fossil or mineral species is first identified....
it occurs in a zone of altered triphylite, LiMn2+PO4, in pegmatite. Typically occurs very late in the sequence of formation of secondary phosphate minerals. Associated at the type locality with vivianite, Fe2+3(PO4)2·8H2O; rockbridgeite, Fe2+Fe3+4(PO4)3(OH)5; heterosite, (Fe3+,Mn3+)PO4 and cacoxenite
Cacoxenite
Cacoxenite is an iron aluminium phosphate mineral with formula: Fe3+24Al17O612·17. It is associated with iron ores. The name comes from the Greek κăκός for "bad" or "evil" and ξένος for "guest" because the phosphorus content of cacoxenite lessens the quality of iron smelted from ore containing...
, Fe3+24AlO6(PO4)17(OH)12·17H2O. It can be synthesised; most natural hureaulites are Mn-rich compounds but extensive (Mn,Fe) solution is known for synthetic material.
Localities
The type localityType locality (geology)
Type locality , also called type area or type locale, is the where a particular rock type, stratigraphic unit, fossil or mineral species is first identified....
is Les Hureaux, Saint-Sylvestre, Haute-Vienne, Limousin
Limousin (région)
Limousin is one of the 27 regions of France. It is composed of three départements: Corrèze, Creuse and the Haute-Vienne.Situated largely in the Massif Central, as of January 1st 2008, the Limousin comprised 740,743 inhabitants on nearly 17 000 km2, making it the second least populated region of...
, France
France
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...
. Hureaulite is also found in a granite pegmatite known for its phosphates in the Aimorés pegmatite district, at the Cigana claim in Galiléia
Galiléia
Galiléia is a town and municipality in the state of Minas Gerais in the Southeast region of Brazil.-References:...
, Doce valley, Minas Gerais
Minas Gerais
Minas Gerais is one of the 26 states of Brazil, of which it is the second most populous, the third richest, and the fourth largest in area. Minas Gerais is the Brazilian state with the largest number of Presidents of Brazil, the current one, Dilma Rousseff, being one of them. The capital is the...
, Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...
, formerly known as the Jocão Mine.