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Brandtite

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Formula:
Ca
 
2
(Mn
2+
 
,Mg)(AsO
 
4
)
 
2
· 2H
 
2
O
System:MonoclinicColour:Colourless, white, pink; ...
Hardness:
Member of:Roselite Group
Name: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:Parabrandtite
Isostructural with:Roselite, Wendwilsonite

Classification of Brandtite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/C.17-110
Nickel-Strunz 10th (pending) edition ID:8.CG.10

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
Dana 8th edition ID:40.2.3.2

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
Hey's CIM Ref.:20.8.14

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

Type Locality:Harstigen Mine, Pajsberg, Persberg district, Filipstad, Värmland, Sweden
Year of Discovery:1888

Physical Properties of Brandtite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colourless, white, pink; colourless in transmitted light.
Hardness (Mohs):
Cleavage:Perfect
On {010}, perfect.
Density (measured):3.67 g/cm3
Density (calculated):3.7 g/cm3

Crystallography of Brandtite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
Cell Parameters:a = 5.89Å, b = 12.96Å, c = 5.68Å
β = 108.05°
Ratio:a:b:c = 0.454 : 1 : 0.438
Unit Cell Volume:V 412.24 ų (Calculated from Unit Cell)
Morphology:Crystals stout prismatic [001]. {100} striated [001]. Frequently grouped into radiated groups. Rounded or reniform masses with a radial-fibrous structure.
Twinning:On {100}, common.

Optical Data of Brandtite

Type:Biaxial (+)
RI values: nα = 1.707 - 1.709 nβ = 1.711 nγ = 1.724 - 1.729
2V:Measured: 22° to 24°, Calculated: 38° to 60°
Maximum Birefringence:δ = 0.017 - 0.020

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r < v strong

Chemical Properties of Brandtite

Formula:
Ca
 
2
(Mn
2+
 
,Mg)(AsO
 
4
)
 
2
· 2H
 
2
O
Simplified for copy/paste:Ca2(Mn2+,Mg)(AsO4)2·2H2O
Essential elements:As, Ca, H, Mn, O
All elements listed in formula:As, Ca, H, Mg, Mn, O

Relationship of Brandtite to other Species

Member of:Roselite Group
Other Members of Group:

- +
Kröhnkite
Na
 
2
Cu(SO
 
4
)
 
2
· 2H
 
2
O
Roselite
Ca
 
2
(Co
2+
 
,Mg)(AsO
 
4
)
 
2
· 2H
 
2
O
Rruffite
Ca
 
2
Cu(AsO
 
4
)
 
2
· 2H
 
2
O
Unnamed (Fe2+-analogue of Brandtite)
Ca
 
2
Fe
2+
 
(AsO
 
4
)
 
2
· 2H
 
2
O
Wendwilsonite
Ca
 
2
Mg(AsO
 
4
)
 
2
· 2H
 
2
O
Zincroselite
Ca
 
2
Zn(AsO
 
4
)
 
2
· 2H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
8.CG.05Cassidyite
Ca
 
2
(Ni
2+
 
,Mg)(PO
 
4
)
 
2
· 2H
 
2
O
8.CG.05Collinsite
Ca
 
2
(Mg,Fe
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
8.CG.05Fairfieldite
Ca
 
2
(Mn
2+
 
,Fe
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
8.CG.05Gaitite
Ca
 
2
Zn(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.05Messelite
Ca
 
2
(Fe
2+
 
,Mn
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
8.CG.05Parabrandtite
Ca
 
2
Mn
2+
 
(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.05Talmessite
Ca
 
2
Mg(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.05Hillite
Ca
 
2
(Zn,Mg)(PO
 
4
)
 
2
· 2 H
 
2
O
8.CG.10Roselite
Ca
 
2
(Co
2+
 
,Mg)(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.10Wendwilsonite
Ca
 
2
Mg(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.10Zincroselite
Ca
 
2
Zn(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.10Rruffite
Ca
 
2
Cu(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.15Ferrilotharmeyerite
Ca(Fe
3+
 
,Zn)
 
2
(AsO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.15Lotharmeyerite
Ca(Zn,Mn
3+
 
)
 
2
(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.15Mawbyite
Pb(Fe
3+
 
,Zn)
 
2
(AsO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.15Mounanaite
PbFe
3+
2
(VO
 
4
)
 
2
· 2(OH,F)
8.CG.15Thometzekite
Pb(Cu,Zn)
 
2
(AsO
 
4
,SO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.15Tsumcorite
Pb(Zn,Fe
3+
 
)
 
2
(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.15Cobaltlotharmeyerite
Ca(Co,Fe
3+
 
,Ni)
 
2
(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.15Cabalzarite
Ca(Mg,Al,Fe
3+
 
)
 
2
(AsO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.15Krettnichite
(Pb,Sr)(Mn
3+
 
,Co)
 
2
(VO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.15Cobalttsumcorite
Pb(Co,Fe
3+
 
,Ni)
 
2
(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.15Nickellotharmeyerite
Ca(Ni,Fe
3+
 
,Co)
 
2
(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.15Manganlotharmeyerite
Ca(Mn
3+
 
,Zn)
 
2
(AsO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.15Schneebergite
(Bi
3+
 
,Ca)(Co,Ni,Fe
3+
 
)
 
2
(AsO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.15Nickelschneebergite
(Bi
3+
 
,Ca)(Ni,Co,Fe
3+
 
)
 
2
(AsO
 
4
)
 
2
· 2(OH,H
 
2
O)
8.CG.20Gartrellite
Pb(Cu,Fe
3+
 
,Zn)
 
2
(AsO
 
4
,SO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.20Helmutwinklerite
Pb(Zn,Cu)
 
2
(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.20Zincgartrellite
Pb(Zn,Fe
3+
 
,Cu)
 
2
(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.20Rappoldite
Pb(Co,Ni,Zn)
 
2
(AsO
 
4
)
 
2
· 2H
 
2
O
8.CG.20Phosphogartrellite
Pb(Cu,Fe
3+
 
)
 
2
(PO
 
4
,AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.20Lukrahnite
Ca(Cu,Zn)(Fe
3+
 
,Zn)(AsO
 
4
)
 
2
· 2(H
 
2
O,OH)
8.CG.25Pottsite
HPbBi(VO
 
4
)
 
2
· 2H
 
2
O
8.CG.35Nickeltalmessite
Ca
 
2
Ni(AsO
 
4
)
 
2
· 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.8.1Sarkinite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.2Eveite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.3Arsenoclasite
Mn
2+
5
(AsO
 
4
)
 
2
(OH)
 
4
20.8.4Flinkite
Mn
2+
2
Mn
3+
 
(AsO
 
4
)(OH)
 
4
20.8.5Jarosewichite
Mn
2+
3
Mn
3+
 
(AsO
 
4
)(OH)
 
6
20.8.6Allactite
Mn
2+
7
(AsO
 
4
)
 
2
(OH)
 
8
20.8.7Krautite
Mn(HAsO
 
4
) · H
 
2
O
20.8.8Synadelphite
Mn
2+
9
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
9
· 2H
 
2
O
20.8.9Sterlinghillite
Mn
 
3
(AsO
 
4
)
 
2
· 4H
 
2
O
20.8.10Geigerite
Mn
2+
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 10H
 
2
O
20.8.11Akrochordite
(Mn
2+
 
,Mg)
 
5
(AsO
 
4
)
 
2
(OH)
 
4
· 4H
 
2
O
20.8.12Manganohörnesite
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
· 8H
 
2
O
20.8.13Fluckite
CaMn
2+
 
(HAsO
 
4
)
 
2
· 2H
 
2
O
20.8.15Parabrandtite
Ca
 
2
Mn
2+
 
(AsO
 
4
)
 
2
· 2H
 
2
O
20.8.16Wallkilldellite-(Mn)
Ca
 
2
Mn
2+
3
(AsO
 
4
)
 
2
(OH)
 
4
· 9H
 
2
O
20.8.17Berzeliite
NaCa
 
2
(Mg,Mn
2+
 
)
 
2
(AsO
 
4
)
 
3
20.8.18Manganberzeliite
(Ca,Na)
 
3
(Mn
2+
 
,Mg)
 
2
(AsO
 
4
)
 
3
20.8.19Magnesiochlorophoenicite
(Mg,Mn)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
20.8.20Villyaellenite
MnMn
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
· 4H
 
2
O
20.8.21Hematolite
(Mn,Mg,Al)
 
15
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23
20.8.22Grischunite
NaCa
 
2
Mn
2+
5
Fe
3+
 
(AsO
 
4
)
 
6
· 2H
 
2
O

Other Names for Brandtite

Other Languages:
German:Brandtit
Russian:Брандтит
Simplified Chinese:砷锰钙石
Spanish:Brandtita
Traditional Chinese:砷鈣錳石

Other Information

Other Information:Soluble in dilute acids.
Health Warning: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

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  • Raman and XRD data at RRUFF project
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  • Brandtite details from Handbook of Mineralogy (PDF)
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  • Localities for Brandtite

    The 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. ? 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.
    Chile
     
    • 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]
    France
     
    • Languedoc-Roussillon
      • 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
    Germany
     
    • 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)
    Greece
     
    • 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).
    Italy
     
    • 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.
    Japan
     
    • 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.
    Kazakhstan
     
    • 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]
    Sweden
     
    • 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.
    Switzerland
     
    • 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.
    UK
     
    • England
      • Devon
        • Okehampton area (Northern Dartmoor)
    USA
     
    • 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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