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Pyroaurite-2H

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Formula:
Mg6Fe23+(CO3)(OH)16 · 4H2O
System:
Hexagonal
Colour:
White, yellowish green, ...
Lustre:
Vitreous, Waxy, Pearly
Hardness:
Name:
Named for the structural relationship to pyroaurite. Originally named sjögrenite by Clifford Frondel in 1940 in honor of Stens Anders Hjalmar Sjögren (1856-1922), Professor of Mineralogy, University of Stockholm, Sweden.
A polytype of Pyroaurite

Originally named sjögrenite. Recognised as a polytype of pyroaurite and accordingly discredited (Mills et al., 2012).

Often intergrown with pyroaurite.

Classification of Pyroaurite-2H

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
5.DA.45

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
16b.6.1.3

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
6 : AmBn(XO3)pZqxH2O & with (m+n):p = 8:1
11.13.3

11 : Carbonates
13 : Carbonates of Fe
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http://www.mindat.org/min-3678.html
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First Recorded Occurrence of Pyroaurite-2H

Physical Properties of Pyroaurite-2H

Vitreous, Waxy, Pearly
Diaphaneity (Transparency):
Transparent
Colour:
White, yellowish green, brownish green, yellowish white, brownish white
Hardness (Mohs):
Cleavage:
Perfect
{0001}
Density:
2.08 - 2.14 g/cm3 (Measured)    2.11 g/cm3 (Calculated)

Crystallography of Pyroaurite-2H

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Cell Parameters:
a = 3.113(3) Å, c = 15.61(1) Å
Ratio:
a:c = 1 : 5.014
Unit Cell Volume:
V 131.01 ų (Calculated from Unit Cell)
Morphology:
Thin plates {0001}, with a hexagonal outline and striated and indistinct lateral faces.
Comment:
Z = 1/4
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.78 (10)
3.90 (6)
2.65 (4)
2.54 (5)
2.39 (3)
2.21 (5)
1.87 (5)

Optical Data of Pyroaurite-2H

Type:
Uniaxial (-)
RI values:
nω = 1.573 nε = 1.550
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of Pyroaurite-2H

Formula:
Mg6Fe23+(CO3)(OH)16 · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Pyroaurite-2H to other Species

5.DA.05DypingiteMg5(CO3)4(OH)2 · 5H2O
5.DA.05GiorgiositeMg5(CO3)4(OH)2 · 5-6H2O
5.DA.05HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
5.DA.05WidgiemoolthaliteNi5(CO3)4(OH)2 · 5H2O
5.DA.05UM1986-10-CO:ClHMgMnZnMg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O
5.DA.05UM1987-01-CO:HMgSMg4(CO3)2(OH)2 · 6H2O ?
5.DA.10ArtiniteMg2(CO3)(OH)2 · 3H2O
5.DA.10IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
5.DA.10ChlorartiniteMg2(CO3)(OH)Cl · 2H2O
5.DA.15OtwayiteNi2(CO3)(OH)2 · H2O
5.DA.15ZaratiteNi3(CO3)(OH)4 · 4H2O
5.DA.20KambaldaiteNaNi4(CO3)3(OH)3 · 3H2O
5.DA.25CallaghaniteCu2Mg2(CO3)(OH)6 · 2H2O
5.DA.30Claraite(Cu,Zn)3(CO3)(OH)4 · 4H2O
5.DA.35HydroscarbroiteAl14(CO3)3(OH)36 · nH2O
5.DA.35ScarbroiteAl5(CO3)(OH)13 · 5H2O
5.DA.40CaresiteFe42+Al2(OH)12[CO3] · 3H2O
5.DA.40QuintiniteMg4Al2(OH)12[CO3] · 3H2O
5.DA.40CharmariteMn42+Al2(OH)12[CO3] · 3H2O
5.DA.45Stichtite-2HMg6(Cr,Al)2(CO3)(OH)16 · 4H2O
5.DA.45BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2O
5.DA.45ChlormagaluminiteMg4Al2(OH)12Cl2 · 3H2O
5.DA.45Hydrotalcite-2HMg6Al2(CO3)(OH)16 · 4H2O
5.DA.45ZaccagnaiteZn4Al2(OH)12[CO3] · 3H2O
5.DA.50ComblainiteNi4Co2(OH)12[CO3] · 3H2O
5.DA.50DesautelsiteMg6Mn23+(OH)16[CO3] · 4H2O
5.DA.50HydrotalciteMg6Al2(OH)16[CO3] · 4H2O
5.DA.50PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
5.DA.50ReevesiteNi6Fe23+(OH)16(CO3) · 4H2O
5.DA.50StichtiteMg6Cr2(OH)16[CO3] · 4H2O
5.DA.50TakoviteNi6Al2(OH)16[CO3] · 4H2O
5.DA.50UM1998-10-CO:CoHNiCo6Fe2(CO3)(OH)16 · 4H2O ?
5.DA.55CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
11.13.1SideriteFeCO3
11.13.2PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
11.13.4BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2O
11.13.5CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
11.13.6AnkeriteCa(Fe2+,Mg)(CO3)2

Other Names for Pyroaurite-2H

Name in Other Languages:
German:Sjögrenit
Simplified Chinese:水碳铁镁石
Spanish:Sjögrenita
Traditional Chinese:水碳鐵鎂石

Other Information

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 Pyroaurite-2H

Reference List:
Aminoff and Broomé (1930), Svenska Vetenskapsakademien, Stockholm, Handlingar: 9: 3, no. 5: 23.

Frondel, C. (1941): Constitution and polymorphism of the pyroaurite and sjögrenite groups. American Mineralogist 26, 295-315.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 659-660.

Allmann, R. and H.-H. Lohse (1966): Die Kristallstruktur des Sjögrenits und eines Umwandlungsproduktes des Koenenits (= Chlor-Manasseits). Neues Jahrb. Mineral., Monatsh., 161–181.

Ingram, L. and H.F.W. Taylor (1967): The crystal structures of sjögrenite and pyroaurite. Mineral. Mag., 36, 465–479.

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1983): 112: 617.

Ivanov, O.K., Y.V. Mozzherin, and V.I. Vilisov (1986): New data on sjögrenite. Izvestiya Akad. Nauk Kazakh. SSR, Geol. Ser. 1, 40–45 (in Russian).

Mills, S.J., Christy, A.G., Genin, J.-M.R., Kameda, T., Colombo, F. (2012): Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76, 1289-1336.

Internet Links for Pyroaurite-2H

Localities for Pyroaurite-2H

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.
Australia
 
  • Tasmania
    • Corinna-Savage River district
Bottrill & Taheri, 2008, Savage River mine, Unpub. Rept, Mineral Resources Tasmania
    • Huon district
      • Weld river
Bottrill & Baker (in prep) Catalogue of minerals of Tasmania
    • Trial Harbour district
Bottrill & Baker (in prep) Catalogue of minerals of Tasmania
    • Zeehan district
      • Mt Heemskirk mineral field
Bottrill & Baker (in prep) Catalogue of minerals of Tasmania
Austria
 
  • Lower Austria
    • Waldviertel
      • Persenbeug-Gottsdorf
        • Loja
Löffler, E. & Kolitsch, U. (2011): Die Mineralien der Loja bei Persenbeug, Niederösterreich (II). Mineralien-Welt. 22 (4): 51-62
Canada
 
  • Québec
    • Chaudière-Appalaches
      • Les Appalaches RCM
        • Saint-Julien
SABINA, A.P. (1967) Geological Survey of canada Paper, 66-51, 170p
Germany
 
  • Bavaria
    • Upper Palatinate
      • Winklarn
Wittern: "Mineralfundorte in Deutschland", 2001
  • Lower Saxony
    • Harz
      • Goslar
        • Grane Reservoir
Schnorrer-Köhler, G. (1991): Mineralogische Notizen V. Aufschluss 42, 155-171.
Italy
 
  • Sardinia
    • Cagliari Province
      • Teulada
Conti L, Cozupoli D., Lombardi G, Traversa g. 1970 - Segnalazione di Sjögrenite nelle contattiti presso Teulada (Sardegna meridionale) Per. Min. Roma, vol. 39 A, (special volume), pp. 119-127
  • Trentino-Alto Adige (Trentino-Südtirol)
    • Trento Province
      • Lagarina Valley
        • Mt. Baldo
          • Ala
            • Pilcante
Bortolozzi G., Boscardin M., Rocchetti I. and Bersani D. (2013): Cafetite e kassite della cava di Pilcante in Val d'Adige (Ala, Trento). Micro, Vol 11, 1, pagg.39-48.
  • Veneto
    • Vicenza Province
      • Astico Valley
        • Cogollo del Cengio
Boscardin M.,Daleffe A.,Rocchetti I., Zordan A. (2011) " Minerali del Vicentino - Aggiornamenti, località e nuove determinazioni " Museo di Archeologia e Scienze Naturali “G. Zannato” – Montecchio Maggiore (Vicenza), pp.183
      • Laghi
Antonio Zordan collection
      • Posina
        • Borcola Pass
Boscardin M.,Daleffe A.,Rocchetti I., Zordan A. (2011) " Minerali del Vicentino - Aggiornamenti, località e nuove determinazioni " Museo di Archeologia e Scienze Naturali “G. Zannato” – Montecchio Maggiore (Vicenza), pp.183
        • Pasubio Massif
          • Punta della Lucche
Boscardin M.,Daleffe A.,Rocchetti I., Zordan A. (2011) " Minerali del Vicentino - Aggiornamenti, località e nuove determinazioni " Museo di Archeologia e Scienze Naturali “G. Zannato” – Montecchio Maggiore (Vicenza), pp.183
Japan
 
  • Honshu Island
    • Chubu Region
      • Aichi prefecture
        • Shinshiro city
Alfredo Petrov - unpublished document - 2007
Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
Kazakhstan
 
  • Northern Kazakhstan Province (Soltüstik Qazaqstan Oblysy; Severo-Kazakhstanskaya Oblast')
    • Zlatogorsk
      • Zlatogorsk ultramafic intrusion
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Russia
 
  • Eastern-Siberian Region
    • Prebaikalia (Pribaikal'e)
      • Irkutskaya Oblast'
        • Zheleznogorsk
Mazurov, M.P., Grishina, S.N., Istomin, V.E., and Titov, A.T. (2007): Geology of Ore Deposits 49(4), 271-284.; Mazurov et al (2007) Geology of Ore Deposits, 49, 271–284.
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Kovdor Massif
http://maurice.strahlen.org/kola/kovdor.htm
Sweden
 
  • Värmland
    • Filipstad
Progr.Abstr.Min.Soc.Amer.(1940) p. 6; 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
Sandström, F., Lorin, T. & Strand, U. (2009): Geologi och mineralogi i Gåsgruvefältet, Filipstad. Litofilen. 26 (2): 16-38
Linden, R.H. (2002): Gåsgruvan, En mineralundersökning under åren 1996-2002. Östra Värmlands Mineralsällskap (Cited in Sandström, F., Lorin, T. & Strand, U. (2009): Geologi och mineralogi i Gåsgruvefältet, Filipstad. Litofilen. 26 (2): 16-38
Östra Värmlands Mineral Society,Långban,Sweden
UK
 
  • Scotland
    • Shetland Islands
      • Unst
        • Baltasound-Haroldswick area
Dr Stephen Moreton collection.
USA
 
  • California
    • San Francisco Co.
      • San Francisco
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 340; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 199.
    • Sonoma Co.
      • Healdsburg
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 200.
www.minresco.com/syst/s.htm
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Ogdensburg
          • Sterling Hill
Dunn, P.J. & Leavens, Min.Rec.:12:371-372: (1981); Dunn(1995):Pt4:625.; Dunn, P. (1995) Franklin and Sterling Hill, privately published.
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