Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
Ca2(Mn2+,Mg)(AsO4)2 · 2H2O
Colourless, white, pink; ...
Member of:
Named by Adolph Erik Nordenskiöld in 1888 in honor of Swedish chemist Georg Brandt [June 26, 1694 Riddarhyttan, Sweden - April 29, 1768 Stockholm, Sweden]. Brandt was the discoverer of cobalt. Weeks (1960) cited an obituary of Georg Brandt and Anton von Swab written by Carl von Linne: "The kingdom and our sciences have now lost in a single year two stars of the first magnitude, Brandt and Svab. The Bureau of Mines and the science of mining have lost their supporting pillars. Men such as these never spring up like mushrooms. So far as I know, Europe has none like them. ... A king can lose an army, but within a year have another ]ust as good. A king can lose a fleet and within two years have another rigged up, but a Brandt and a Svab cannot be gotten again during his entire reign"
Dimorph of:
Isostructural with:

Classification of Brandtite

Approved, 'Grandfathered' (first described prior to 1959)

C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1

2 : AB2(XO4)2·xH2O

20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn

Physical Properties of Brandtite

Diaphaneity (Transparency):
Transparent, Translucent
Colourless, white, pink; colourless in transmitted light.
Hardness (Mohs):
On {010}, perfect.
3.67 g/cm3 (Measured)    3.7 g/cm3 (Calculated)

Optical Data of Brandtite

Biaxial (+)
RI values:
nα = 1.707 - 1.709 nβ = 1.711 nγ = 1.724 - 1.729
Measured: 22° to 24°, Calculated: 38° to 60°
Max Birefringence:
δ = 0.017 - 0.020
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
r < v strong

Chemical Properties of Brandtite

Ca2(Mn2+,Mg)(AsO4)2 · 2H2O
IMA Formula:
Ca2Mn2+(AsO4)2 · 2H2O
Elements listed in formula:

Crystallography of Brandtite

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 5.89 Å, b = 12.96 Å, c = 5.68 Å
β = 108.05°
a:b:c = 0.454 : 1 : 0.438
Unit Cell Volume:
V 412.24 ų (Calculated from Unit Cell)
Crystals stout prismatic [001]. {100} striated [001]. Frequently grouped into radiated groups. Rounded or reniform masses with a radial-fibrous structure.
On {100}, common.

Type Occurrence of Brandtite

Relationship of Brandtite to other Species

Member of:
Other Members of Group:
KröhnkiteNa2Cu(SO4)2 · 2H2O
RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
RruffiteCa2Cu(AsO4)2 · 2H2O
Unnamed (Fe2+-analogue of Brandtite)Ca2Fe2+(AsO4)2 · 2H2O
WendwilsoniteCa2Mg(AsO4)2 · 2H2O
ZincroseliteCa2Zn(AsO4)2 · 2H2O
8.CG.05CassidyiteCa2(Ni2+,Mg)(PO4)2 · 2H2O
8.CG.05CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2O
8.CG.05FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2O
8.CG.05GaititeCa2Zn(AsO4)2 · 2H2O
8.CG.05MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2O
8.CG.05ParabrandtiteCa2Mn2+(AsO4)2 · 2H2O
8.CG.05β-RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
8.CG.05TalmessiteCa2Mg(AsO4)2 · 2H2O
8.CG.05HilliteCa2(Zn,Mg)(PO4)2 · 2 H2O
8.CG.10RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
8.CG.10WendwilsoniteCa2Mg(AsO4)2 · 2H2O
8.CG.10ZincroseliteCa2Zn(AsO4)2 · 2H2O
8.CG.10RruffiteCa2Cu(AsO4)2 · 2H2O
8.CG.15FerrilotharmeyeriteCa(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
8.CG.15LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)
8.CG.15MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
8.CG.15ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
8.CG.15TsumcoritePbZn2(AsO4)2 · 2H2O
8.CG.15CobaltlotharmeyeriteCa(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
8.CG.15CobalttsumcoritePb(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
8.CG.15NickellotharmeyeriteCa(Ni,Fe3+,Co)2(AsO4)2 · 2(H2O,OH)
8.CG.15Nickelschneebergite(Bi3+,Ca)(Ni,Co,Fe3+)2(AsO4)2 · 2(OH,H2O)
8.CG.20GartrellitePb(Cu,Fe3+,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
8.CG.20HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2O
8.CG.20ZincgartrellitePb(Zn,Fe3+,Cu)2(AsO4)2 · 2(H2O,OH)
8.CG.20RappolditePb(Co,Ni,Zn)2(AsO4)2 · 2H2O
8.CG.20PhosphogartrellitePb(Cu,Fe3+)2(PO4,AsO4)2 · 2(H2O,OH)
8.CG.20LukrahniteCa(Cu,Zn)(Fe3+,Zn)(AsO4)2 · 2(H2O,OH)
8.CG.25Pottsite(Pb3xBi4-2x)(VO4)4·H2O (0.8 < x < 1.0)
8.CG.35NickeltalmessiteCa2Ni(AsO4)2 · 2H2O
20.8.7KrautiteMn(HAsO4) · H2O
20.8.8SynadelphiteMn92+(As5+O4)2(As3+O3)(OH)9 · 2H2O
20.8.9SterlinghilliteMn3(AsO4)2 · 4H2O
20.8.10GeigeriteMn52+(AsO4)2(HAsO4)2 · 10H2O
20.8.11Akrochordite(Mn2+,Mg)5(AsO4)2(OH)4 · 4H2O
20.8.12Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2O
20.8.13FluckiteCaMn2+(HAsO4)2 · 2H2O
20.8.15ParabrandtiteCa2Mn2+(AsO4)2 · 2H2O
20.8.16WallkilldelliteCa2Mn32+(AsO4)2(OH)4 · 9H2O
20.8.20VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2O
20.8.22GrischuniteNaCa2Mn52+Fe3+(AsO4)6 · 2H2O

Other Names for Brandtite

Name in Other Languages:
Simplified Chinese:砷锰钙石
Traditional Chinese:砷鈣錳石

Other Information

Other Information:
Soluble in dilute acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Brandtite

Reference List:
Nordenskiöld (1888) Svenska Vetenskapsakademien, Stockholm, Handlingar [Ak. Stockholm Öfv.]: 45: 418.

Lindström (1891) Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm: 13L: 123 (Nordenskiöld description in).

Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 811.

Goldschmidt, V. (1913) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 1: 228.

Aminoff (1919) Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm: 41: 161.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 50.

Wolfe (1940) American Mineralogist: 25: 750.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 725-727.

Dahlman, B. (1952): The crystal structures of kröhnkite, CuNa2(SO4)2.2H2O and brandtite, MnCa2(AsO4)2.2H2O. Arkiv för Mineralogi och Geologi, 1, 339-366.

Hawthorne, F. C. and Ferguson, R. B. (1977): The crystal structure of roselite. Canadian Mineralogist 15, 36-42.

Hejny, C., Giester, G., Wildner, M., Götzinger, M. (1997): Die Kristallstruktur von Brandtit, Ca2Mn(AsO4)2 2H2O. European Journal of Mineralogy, Beih. 1, 150.

Internet Links for Brandtite URL:
Please feel free to link to this page.

Localities for Brandtite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
  • Atacama Region
    • Copiapó Province
      • Pabellón
        • Chinchado-Sacramento district
Segerstrom, K.(1960); "Cuadrángulo Quebrada Paipote"; Instituto de Investigaciones Geológicas; Stgo de Chile
Segerstrom, K.(1959); "Cuadrángulo Los Loros"; Instituto de Investigaciones Geológicas; Stgo de Chile
      • Tierra Amarilla
        • Pampa Larga district
maurizio dini collection - quantitative analysis
Czech Republic
  • Bohemia (Böhmen; Boehmen)
    • Central Bohemia Region
      • Příbram
        • Vrančice
[Lapis 1995, 12, p.13-24]
  • Occitanie
    • Aude
      • Carcassonne
        • Mas-Cabardès
          • Salsigne
Le Règne Minéral, Hors série (3), 36-54
Pelison P., Descouens D. (1987), Présence de minéraux de néoformation dans les scories de l'ancienne usine de Villagnère (Aude), Le Cahier des Micromonteurs, n°2, pp: 6-10
  • Bavaria
    • Franconia
      • Spessart
        • Hösbach
          • Sailauf
            • Hartkoppe
Lorenz, J. (1991): Die Mineralien im Rhyolithsteinbruch von Sailauf, Der Aufschluss, Vol. 42, 1-38
  • Saxony
    • Erzgebirge
Lapis 30(7/8):78-80 (2005)
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
          • Kamariza Mines (Kamareza Mines)
            • Hilarion area
Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (I). Mineralien-Welt 25 (1), 60-75 (in German).
  • Liguria
    • La Spezia Province
      • Rocchetta Vara
Balestra, C., Kolitsch, U., Blaß, G., Callegari, A.M., Baiocchi, M., Armellino, G., Ciriotti, M.E., Ambrino, P., Bracco, R.: Mineralogia ligure 2007-2008: novità caratterizzate dal servizio UK dell'AMI. Micro (UK report) 1/2009 pp. 78-99
  • Piedmont
    • Torino Province
      • Lanzo Valleys
        • Viù Valley
          • Usseglio
Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
  • Honshu Island
    • Tohoku Region
      • Fukushima Prefecture
        • Iwaki City
Matsubara, S. (2000); R. Marumoto collection; Matsubara, S., Miyawaki, R., Kato, A., Matsuyama, F., Mouri, T. and Suzuki, Y. (2001): Arseniopleite from the Gozaisho mine, Fukushima Prefecture, Japan. Bull. Natn. Sci. Mus., Tokyo, Ser. C, 27, 51-62.
  • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
    • Zhayrem (Zhairem)
Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30
Frank Dzubeck
South Africa
  • Northern Cape Province
    • Kalahari manganese field
      • Hotazel
[MinRec 22:480]
  • Värmland
    • Filipstad
Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
      • Persberg district
        • Pajsberg
Lindström, G. (1891): Mineralanalyser. 1. Brandtit från Harstigen. Geologiska Föreningens i Stockholm Förhandlingar 13: 123-126; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 726, 857; Canadian Mineralogist (1977): 15: 36; Mineralogical Record: 8: 517, 900; Mineralogical Record: 22: 49.
  • Grischun (Grisons; Graubünden)
    • Albula Valley
      • Oberhalbstein (Surses; Sursass)
        • Tinizong (Tinzen)
Geiger, T. (1948): Brandtit aus dem Oberhalbstein GR. Schweiz. Mineral. Petrogr. Mitt. 28, 468-474.
  • England
    • Devon
      • Okehampton area (Northern Dartmoor)
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Ogdensburg
          • Sterling Hill
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 726; Gaines, R.V. (1959) American Mineralogist: 44: 199-200; Mineralogical Record: 13: 36; Dunn, P.J. (1995): Dunn, Pete J. (1995): Franklin and Sterling Hill New Jersey: the world’s most magnificent mineral deposits, part 5: 659.
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2017, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: July 24, 2017 17:43:34 Page generated: July 14, 2017 21:33:14
Go to top of page