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Na2Fe3+(SO4)2(OH) · H2O
Golden yellow, straw ...
1½ - 2½
From the Greek for meta, signifying a lower hydrate and the mineral sideronatrite.
A rare sodium-iron-sulphate occurring in arid regions.

Reversibly rehydrates to sideronatrite depending on relative humidity and exposure to sunlight.

Classification of Metasideronatrite

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

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
F : With large and medium-sized cations

8 : (AB)3(XO4)2Zq·xH2O

25 : Sulphates
11 : Sulphates of Fe and other metals

Physical Properties of Metasideronatrite

Diaphaneity (Transparency):
Golden yellow, straw yellow; yellow in transmitted light.
Hardness (Mohs):
1½ - 2½
Perfect on {100} {010}
Nearly perfect on {001}
2.68 g/cm3 (Measured)    2.68 g/cm3 (Calculated)

Optical Data of Metasideronatrite

Biaxial (+)
RI values:
nα = 1.543 nβ = 1.575 nγ = 1.634
Measured: 60° , Calculated: 76°
Max Birefringence:
δ = 0.091
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
strong r > v
X = a = Colourless
Y = b = Pale yellow
Z = c = Brownish yellow

Chemical Properties of Metasideronatrite

IMA Formula:
Na2Fe3+(SO4)2(OH) · H2O
Elements listed in formula:

Crystallography of Metasideronatrite

Crystal System:
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 7.3959(8) Å, b = 16.0979(15) Å, c = 7.1607(8) Å
a:b:c = 0.459 : 1 : 0.445
Unit Cell Volume:
V 852.54 ų (Calculated from Unit Cell)
Rare crystals are prismatic [001]. Commonly in coarse to fine crystalline aggregates.
Space group Pbnm (non-standard setting of Pnma).

Occurrences of Metasideronatrite

Type Occurrence of Metasideronatrite

Empirical Formula:
Na4Fe23+(SO4)4(OH)2 · 3H2O

Relationship of Metasideronatrite to other Species

7.DF.05UklonskoviteNaMg(SO4)F · 2H2O
7.DF.10KainiteKMg(SO4)Cl · 3H2O
7.DF.15NatrochalciteNaCu2(SO4)2(OH) · H2O
7.DF.20SideronatriteNa2Fe3+(SO4)2(OH) · 3H2O
7.DF.25DespujolsiteCa3Mn4+(SO4)2(OH)6 · 3H2O
7.DF.25FleischeritePb3Ge(SO4)2(OH)6 · 3H2O
7.DF.25SchaurteiteCa3Ge4+(SO4)2(OH)6 · 3H2O
7.DF.25MallestigitePb3Sb(SO4)(AsO4)(OH)6 · 3H2O
7.DF.30Slavíkite(H3O)31+Mg6Fe15(SO4)21(OH)18 · 98H2O
7.DF.35MetavoltineK2Na6Fe2+Fe63+O2(SO4)12 · 18H2O
7.DF.40LannoniteHCa4Mg2Al4(SO4)8F9 · 32H2O
7.DF.40VlodavetsiteCa2Al(SO4)2F2Cl · 4H2O
7.DF.45PeretaiteCaSb43+O4(SO4)2(OH)2 · 2H2O
7.DF.50GordaiteNaZn4(SO4)(OH)6Cl · 6H2O
7.DF.55Clairite(NH4)2Fe33+(SO4)4(OH)3 · 3H2O
7.DF.60ArzrunitePb2Cu4SO4(OH)4Cl6 · 2H2O
7.DF.65ElyiteCuPb4(SO4)O2(OH)4 · H2O
7.DF.70YecoraiteFe33+Bi5O9(Te4+O3)(Te6+O4)2 · 9H2O
7.DF.75RiomarinaiteBiSO4(OH) · H2O
7.DF.80DukeiteBi243+Cr86+O57(OH)6 · 3H2O
7.DF.85XocolatliteCa2Mn24+Te26+O12 · H2O
25.11.2SideronatriteNa2Fe3+(SO4)2(OH) · 3H2O
25.11.4FerrinatriteNa3Fe3+(SO4)3 · 3H2O
25.11.5AmarilliteNaFe3+(SO4)2 · 6H2O
25.11.7KrausiteKFe3+(SO4)2 · H2O
25.11.8GoldichiteKFe3+(SO4)2 · 4H2O
25.11.10VoltaiteK2Fe52+Fe33+Al(SO4)12 · 18H2O
25.11.11UngemachiteK3Na8Fe3+(SO4)6(NO3)2 · 6H2O
25.11.12MetavoltineK2Na6Fe2+Fe63+O2(SO4)12 · 18H2O
25.11.15Clairite(NH4)2Fe33+(SO4)4(OH)3 · 3H2O
25.11.16Mohrite(NH4)2Fe2+(SO4)2 · 6H2O
25.11.17LonecreekiteNH4Fe3+(SO4)2 · 12H2O
25.11.19BotryogenMgFe3+(SO4)2(OH) · 7H2O
25.11.21Slavíkite(H3O)31+Mg6Fe15(SO4)21(OH)18 · 98H2O
25.11.23SturmaniteCa6Fe23+(SO4)2.5[B(OH)4](OH)12 · 25H2O
25.11.25Aluminocopiapite(Al,Mg)Fe43+(SO4)6(OH,O)2 · 20H2O
25.11.26HalotrichiteFe2+Al2(SO4)4 · 22H2O
25.11.27Idrizite(Mg,Fe)(Al,Fe)2(SO4)3(OH)2 · 15H2O or near
25.11.28LishizheniteZnFe23+(SO4)4 · 14H2O
25.11.29ZincovoltaiteK2Zn5Fe33+Al(SO4)12 · 18H2O

Other Names for Metasideronatrite

Name in Other Languages:

Other Information

Other Information:
Decomposes in boiling water and is insoluble in cold water. Soluble in dilute acids. Reversibly alters to sideronatrite depending upon humidity and light exposure.
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 Metasideronatrite

Reference List:
Bandy (1938) American Mineralogist: 23: 733.

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.: 603-604.

Scordari, F., Stasi, F., and Milella, G. (1982) Concerning metasideronatrite. Neues Jahrbuch für Mineralogie, Monatshefte (1982): 8: 341-347.

Kolitsch, U. (2008): Unpubl. crystal-structure determination [Pnma cell: 16.005, 7.124, 7.351 A; model in good agreement with Scordari et al. (2010)].

Scordari, F., Ventruti, G., Stasi, F. (2010): Metasideronatrite: crystal structure and its relationship with sideronatrite. American Mineralogist, 95, 329-334.

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

Localities for Metasideronatrite

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.
Chile (TL)
  • Antofagasta Region
    • Antofagasta Province
NJMM (1982), 255
tested by Ron Peterson Queens University, Kingston Ontario
    • El Loa Province
      • Calama
        • Chuquicamata District
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.: 457, 604; Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols.
  • Tarapacá Region
    • El Tamarugal Province
      • Pampa del Tamarugal
Peter G. Seroka collection
  • Xinjiang Autonomous Region
    • Hami Prefecture (Kumul Prefecture; Qumul Prefecture)
      • Hami Co. (Kumul Co.; Qumul Co.)
Yingxia Xu, Kezhang Qin, Kunshou Ding, Jinxiang Li, Yu Miao, Tonghui Fang, Xingwang Xu, Daming Li, and Xiuquan Luo (2008): Acta Petrologica Sinica 24(10), 2371-2383
Czech Republic
  • Moravia (Mähren; Maehren)
    • Moravia-Silesia Region
      • Karviná
Matýsek D., Jirásek J., Osovský M., Skupien P.. Minerals formed by the weathering of sulfides in mines of the Czech part of the Upper Silesian Basin. Mineralogical Magazine, 2014, 78, 5, 1265-1286.
        • Orlová
Matýsek D., Jirásek J., Osovský M., Skupien P.. Minerals formed by the weathering of sulfides in mines of the Czech part of the Upper Silesian Basin. Mineralogical Magazine, 2014, 78, 5, 1265-1286.
Matýsek D., Jirásek J., Osovský M., Skupien P.. Minerals formed by the weathering of sulfides in mines of the Czech part of the Upper Silesian Basin. Mineralogical Magazine, 2014, 78, 5, 1265-1286.
          • Lazy Mine
Matýsek D., Jirásek J., Osovský M., Skupien P.. Minerals formed by the weathering of sulfides in mines of the Czech part of the Upper Silesian Basin. Mineralogical Magazine, 2014, 78, 5, 1265-1286.
  • Saxony
    • Dresden
Thalheim, K.; Reichel, W. & Witzke, T. (1991): Die Minerale des Döhlener Beckens.- Schriften des Staatlichen Museums für Mineralogie und Geologie zu Dresden, Nr. 3
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Sounion area
          • Sounion Mines
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).
  • Co. Kerry
Moreton et al. (1995) Irish J. Earth Sciences, 14, 1-5..
  • Tuscany
    • Siena Province
      • Chiusdino
Menchetti, S., Batoni, M., Batacchi, C., Borselli, G., Brogi, A., Ceccantini, L., Fassina, B., Marchesini, M., Rossellini, A. & Ruggieri, G. (2015): Le Cetine di Cotorniano. Miniera e minerali. Associazione Micro-Mineralogica Italiana, Cremona, 354 p.
  • Erongo Region
    • Swakopmund District
      • Arandis
        • Rössing Mountains Area
NHM Vienna collection (Uwe Kolitsch SXRD analysis; to be published)
  • Andalusia
    • Almería
      • Níjar
A. Arribas, F. Hernández, M. A. Fernández Périz, J. Gröbner, G. Leal (2005): Rodalquilar - El oro del capo del ágata. BOCAMINA 15, 12-88.
G. Leal, Antonio Arribas, Miguel A. Fernandez, Joachim Grobner, Francisco Hernandez (2005): Rodalquilar : El oro del Cabo del Agata. Bocamina, 15, 14-79.
  • Vaud (Waadt)
    • Bex
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 272.
  • England
    • Hampshire
      • Milton
MinMag 63:757
  • Arizona
    • Coconino Co.
      • Cameron District
Bollin, E. M., & Kerr, P. F. (1958). Uranium mineralization near Cameron, Arizona. In Guidebook of the Black Mesa Basin, northern Arizona: New Mexico Geological Society, 9th Field Conference Society Guidebook (Vol. 9, pp. 161-168).
          • Huskon Mines
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 295.
  • Colorado
    • Montrose Co.
      • Bull Canyon District
        • Radium Hill Group
Minerals of Colorado (1997) E.B. Eckels
  • Nevada
    • Eureka Co.
      • Beowawe District
NBMG Spec. Pub. 31 Minerals of Nevada
      • Crescent Valley
Minerals of Nevada, by Castor and Ferdock, 2004; p. 117
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