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Ca2(Mn2+,Mg)(AsO4)2 · 2H2O
Colourless, white, pink; colourless in transmitted light.
Specific Gravity:
Crystal System:
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:
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Classification of BrandtiteHide

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 BrandtiteHide

Transparent, Translucent
Colourless, white, pink; colourless in transmitted light.
3½ on Mohs scale
On {010}, perfect.
3.67 g/cm3 (Measured)    3.7 g/cm3 (Calculated)

Optical Data of BrandtiteHide

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 BrandtiteHide

Ca2(Mn2+,Mg)(AsO4)2 · 2H2O
IMA Formula:
Ca2Mn2+(AsO4)2 · 2H2O

Crystallography of BrandtiteHide

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 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 BrandtiteHide

Other Language Names for BrandtiteHide

Simplified Chinese:砷锰钙石
Traditional Chinese:砷鈣錳石

Relationship of Brandtite to other SpeciesHide

Member of:
Other Members of this group:
KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
RruffiteCa2Cu(AsO4)2 · 2H2OMon. 2/m : P21/b
Unnamed (Fe2+-analogue of Brandtite)Ca2Fe2+(AsO4)2 · 2H2O
WendwilsoniteCa2Mg(AsO4)2 · 2H2OMon. 2/m : P21/b
ZincroseliteCa2Zn(AsO4)2 · 2H2OMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Calcite6 photos of Brandtite associated with Calcite on
Sarkinite4 photos of Brandtite associated with Sarkinite on
Caryopilite3 photos of Brandtite associated with Caryopilite on
Willemite2 photos of Brandtite associated with Willemite on
Unnamed (Fe2+-analogue of Parabrandtite)2 photos of Brandtite associated with Unnamed (Fe2+-analogue of Parabrandtite) on
Flinkite1 photo of Brandtite associated with Flinkite on
Rhodochrosite1 photo of Brandtite associated with Rhodochrosite on
Franklinite1 photo of Brandtite associated with Franklinite on
Kutnohorite1 photo of Brandtite associated with Kutnohorite on
Sailaufite1 photo of Brandtite associated with Sailaufite on

Related Minerals - Nickel-Strunz GroupingHide

8.CG.05CassidyiteCa2(Ni2+,Mg)(PO4)2 · 2H2OTric.
8.CG.05CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2OTric. 1 : P1
8.CG.05FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2OTric. 1 : P1
8.CG.05GaititeCa2Zn(AsO4)2 · 2H2OTric.
8.CG.05MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2OTric. 1 : P1
8.CG.05ParabrandtiteCa2Mn2+(AsO4)2 · 2H2OTric.
8.CG.05β-RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2OTric.
8.CG.05TalmessiteCa2Mg(AsO4)2 · 2H2OTric.
8.CG.05HilliteCa2(Zn,Mg)(PO4)2 · 2 H2OTric. 1 : P1
8.CG.10RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10WendwilsoniteCa2Mg(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10ZincroseliteCa2Zn(AsO4)2 · 2H2OMon.
8.CG.10RruffiteCa2Cu(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.15FerrilotharmeyeriteCa(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)Mon. 2/m : B2/m
8.CG.15LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)Mon.
8.CG.15MounanaitePbFe3+2(VO4)2(OH,F)2Mon. 2/m : B2/m
8.CG.15ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15TsumcoritePbZn2(AsO4)2 · 2H2OMon.
8.CG.15CobaltlotharmeyeriteCa(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15CabalzariteCa(Mg,Al,Fe3+)2(AsO4)2(OH,H2O)2Mon. 2/m : B2/m
8.CG.15KrettnichitePbMn3+2(VO4)2(OH)2Mon. 2/m : B2/m
8.CG.15CobalttsumcoritePb(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15NickellotharmeyeriteCa(Ni,Fe3+,Co)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15ManganlotharmeyeriteCaMn3+2(AsO4)2(OH)2Mon. 2/m : B2/m
8.CG.15Schneebergite(Bi3+,Ca)(Co,Ni,Fe3+)2(AsO4)2(OH,H2O)2Mon. 2/m : B2/m
8.CG.15Nickelschneebergite(Bi3+,Ca)(Ni,Co,Fe3+)2(AsO4)2 · 2(OH,H2O)Mon. 2/m : B2/m
8.CG.20GartrellitePb(Cu,Fe3+,Zn)2(AsO4,SO4)2 · 2(H2O,OH)Tric. 1 : P1
8.CG.20HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2OTric.
8.CG.20ZincgartrellitePb(Zn,Fe3+,Cu)2(AsO4)2 · 2(H2O,OH)Tric. 1 : P1
8.CG.20RappolditePb(Co,Ni,Zn)2(AsO4)2 · 2H2OTric.
8.CG.20PhosphogartrellitePb(Cu,Fe3+)2(PO4,AsO4)2 · 2(H2O,OH)Tric.
8.CG.20LukrahniteCa(Cu,Zn)(Fe3+,Zn)(AsO4)2 · 2(H2O,OH)Tric. 1 : P1
8.CG.25Pottsite(Pb3xBi4-2x)(VO4)4·H2O (0.8 < x < 1.0)Tet. 4/m : I41/a
8.CG.35NickeltalmessiteCa2Ni(AsO4)2 · 2H2OTric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b · 2H2OMon. · 2H2OMon. 2/m : P21/b · 2H2OTric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.8.1SarkiniteMn2+2(AsO4)(OH)Mon. 2/m : P2/m
20.8.2EveiteMn2+2(AsO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnnm
20.8.5JarosewichiteMn2+3Mn3+(AsO4)(OH)6Orth. 2 2 2
20.8.6AllactiteMn2+7(AsO4)2(OH)8Mon. 2/m : P21/b
20.8.7KrautiteMn(HAsO4) · H2OMon. 2 : P21
20.8.8SynadelphiteMn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
20.8.9SterlinghilliteMn3(AsO4)2 · 4H2OTric. 1 : P1
20.8.10GeigeriteMn2+5(AsO4)2(HAsO4)2 · 10H2OTric.
20.8.11Akrochordite(Mn2+,Mg)5(AsO4)2(OH)4 · 4H2OMon. 2/m : P21/b
20.8.12Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2OMon. 2/m : P2/m
20.8.13FluckiteCaMn2+(HAsO4)2 · 2H2OTric. 1 : P1
20.8.15ParabrandtiteCa2Mn2+(AsO4)2 · 2H2OTric.
20.8.16WallkilldelliteCa2Mn2+3(AsO4)2(OH)4 · 9H2OHex.
20.8.17Berzeliite(NaCa2)Mg2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
20.8.18ManganberzeliiteNaCa2Mn2+2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
20.8.19Magnesiochlorophoenicite(Mg,Mn)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
20.8.20VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
20.8.21Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23Trig. 3 : R3
20.8.22GrischuniteNaCa2Mn2+5Fe3+(AsO4)6 · 2H2OOrth.

Other InformationHide

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 BrandtiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 BrandtiteHide

Localities for BrandtiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • 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.
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