Brassite is a rare

arsenate mineral Arsenate minerals usually refer to the naturally occurring orthoarsenates, possessing the (AsO4)3− anion group and, more rarely, other arsenates with anions like AsO3(OH)2− (also written HAsO42−) (example: pharmacolite Ca(AsO3OH).2H2O) or ...

with the chemical formula Mg(AsO₃OH)·4(H₂O). It was named brassite, in 1973, to honor French chemist Réjane Brasse, who first synthesized the compound. The type locality for brassite is

Jáchymov Jáchymov (; or ''Joachimsthal'') is a spa town in Karlovy Vary District in the Karlovy Vary Region of the Czech Republic. It has about 2,300 inhabitants. Jáchymov has a long mining tradition, thanks to which it used to be the second most popu ...

of the

Czech Republic The Czech Republic, also known as Czechia, and historically known as Bohemia, is a landlocked country in Central Europe. The country is bordered by Austria to the south, Germany to the west, Poland to the northeast, and Slovakia to the south ...

. It occurs as an alteration of magnesium carbonate minerals by arsenic bearing solutions. It occurs associated with

pharmacolite Pharmacolite is an uncommon calcium arsenate mineral with formula CaHAsO4·2(H2O). It occurs as soft, white clusters of fibrous crystals and encrustations which crystallize in the monoclinic system. It is the arsenate analogue of the sulfate minera ...

picropharmacolite Picropharmacolite, Ca4Mg(AsO3OH)2(AsO4)2·11H2O, is a rare arsenate mineral. It was named in 1819 from the Greek for bitter, in allusion to its magnesium content, and its chemical similarity to pharmacolite. The mineral irhtemite, Ca4Mg(AsO3OH ...

, weilite,

haidingerite Haidingerite is a calcium arsenate mineral with formula Ca(AsO3OH)·H2O. It crystallizes in the orthorhombic crystal system as short prismatic to equant crystals. It typically occurs as scaly, botryoidal or fibrous coatings.http://rruff.geo.arizona ...

, rauenthalite, native arsenic,

realgar Realgar ( ), also known as arsenic blende, ruby sulphur or ruby of arsenic, is an arsenic sulfide mineral with the chemical formula α-. It is a soft, sectile mineral occurring in monoclinic crystals, or in granular, compact, or powdery form, ...

and dolomite.

Localities

Czech Republic: *

Ore Mountains The Ore Mountains (, or ; ) lie along the Czech–German border, separating the historical regions of Bohemia in the Czech Republic and Saxony in Germany. The highest peaks are the Klínovec in the Czech Republic (German: ''Keilberg'') at ab ...

Karlovy Vary Region The Karlovy Vary Region () is an administrative unit () of the Czech Republic, located in the westernmost part of the country. It is named after its capital Karlovy Vary. It is known for spas, which include Karlovy Vary and Mariánské Lázně. ...

, Czech Republic France: *Salsigne mine, Salsigne,

Mas-Cabardès Mas-Cabardès (; ) is a Communes of France, commune in the Aude Departments of France, department in southern France. Population See also *Communes of the Aude department ReferencesWater quality in Mas-Cabardès
Communes of Aude ...

Carcassonne Carcassonne is a French defensive wall, fortified city in the Departments of France, department of Aude, Regions of France, region of Occitania (administrative region), Occitania. It is the prefectures in France, prefecture of the department. ...

Aude Aude ( ; ) is a Departments of France, department in Southern France, located in the Occitania (administrative region), Occitanie Regions of France, region and named after the river Aude (river), Aude. The departmental council also calls it " ...

Languedoc-Roussillon Languedoc-Roussillon (; ; ) is a former regions of France, administrative region of France. On 1 January 2016, it joined with the region of Midi-Pyrénées to become Occitania (administrative region), Occitania. It comprised five departments o ...

, France *

Villanière Villanière (; ) is a commune in the Aude department in southern France. Population See also *Communes of the Aude department The following is a list of the 433 Communes of France, communes of the Aude Departments of France, department o ...

(

slag The general term slag may be a by-product or co-product of smelting (pyrometallurgical) ores and recycled metals depending on the type of material being produced. Slag is mainly a mixture of metal oxides and silicon dioxide. Broadly, it can be c ...

locality), Salsigne, Mas-Cabardès, Carcassonne, Aude, Languedoc-Roussillon, France Germany: *Wilhelm Mine (Wechselschacht),

Bauhaus The Staatliches Bauhaus (), commonly known as the , was a German art school operational from 1919 to 1933 that combined Decorative arts, crafts and the fine arts.Oxford Dictionary of Art and Artists (Oxford: Oxford University Press, 4th edn., ...

, Richelsdorf District,

Hesse Hesse or Hessen ( ), officially the State of Hesse (), is a States of Germany, state in Germany. Its capital city is Wiesbaden, and the largest urban area is Frankfurt, which is also the country's principal financial centre. Two other major hist ...

, Germany *Ore dumps, Richelsdorf Smelter, Süss, Richelsdorf District, Hesse, Germany

References

Magnesium minerals Arsenate minerals Orthorhombic minerals Minerals in space group 61 {{mineral-stub