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Metahohmannite

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About MetahohmanniteHide

Formula:
Fe3+2(SO4)2O · 4H2O
Colour:
Orange
Crystal System:
Triclinic
Name:
The name is derived from 'meta', for its lower hydration level, and its relationship to hohmannite.
Pulverulent masses formed by the partial dehydration of hohmannite.


Classification of MetahohmanniteHide

Approved, 'Grandfathered' (first described prior to 1959)
7.DB.30

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
B : With only medium-sized cations; insular octahedra and finite units
31.9.5.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
25.10.13

25 : Sulphates
10 : Sulphates of Fe alone

Physical Properties of MetahohmanniteHide

Colour:
Orange

Optical Data of MetahohmanniteHide

Type:
Biaxial (+)
RI values:
nα = 1.709 nβ = 1.718 nγ = 1.734
2V:
Measured: 70° , Calculated: 76°
Max Birefringence:
δ = 0.025
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v weak
Pleochroism:
Visible
Comments:
X = Light yellow
Y = Reddish yellow
Z = Reddish brown

Chemical Properties of MetahohmanniteHide

Formula:
Fe3+2(SO4)2O · 4H2O
IMA Formula:
Fe3+2O(SO4)2 · 4H2O

Crystallography of MetahohmanniteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.3484(5) Å, b = 9.7710(6) Å, c = 7.1521(5) Å
α = 91.684(5)°, β = 98.523(5)°, γ = 86.390(5)°
Ratio:
a:b:c = 0.752 : 1 : 0.732
Unit Cell V:
506.75 ų (Calculated from Unit Cell)
Morphology:
Pulverulent masses.
Comment:
Non-standard setting.

Type Occurrence of MetahohmanniteHide

Other Language Names for MetahohmanniteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hohmannite1 photo of Metahohmannite associated with Hohmannite on mindat.org.
Amarantite1 photo of Metahohmannite associated with Amarantite on mindat.org.
Fibroferrite1 photo of Metahohmannite associated with Fibroferrite on mindat.org.
Copiapite1 photo of Metahohmannite associated with Copiapite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.DB.05AubertiteCuAl(SO4)2Cl · 14H2OTric. 1
7.DB.05Magnesioaubertite(Mg,Cu)Al(SO4)2Cl · 14H2O
7.DB.05Svyazhinite(Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2OTric.
7.DB.10KhademiteAl(SO4)F · 5H2OOrth. mmm (2/m 2/m 2/m)
7.DB.10RostiteAl(SO4)(OH) · 5H2OOrth. mmm (2/m 2/m 2/m)
7.DB.15JurbaniteAl(SO4)(OH) · 5H2OMon.
7.DB.20Minasragrite(V4+O)(SO4) · 5H2OMon. 2/m
7.DB.20Orthominasragrite(V4+O)(SO4) · 5H2OOrth. mm2 : Pmn21
7.DB.20Anorthominasragrite(V4+O)(SO4) · 5H2OTric. 1 : P1
7.DB.25Bobjonesite(V4+O)(SO4) · 3H2OMon. 2/m
7.DB.30AmarantiteFe3+2(SO4)2O · 7H2OTric. 1
7.DB.30HohmanniteFe3+2(SO4)2O · 8H2OTric. 1
7.DB.35AluminocopiapiteAl2/3Fe3+4(SO4)6(OH)2 · 20H2OTric. 1 : P1
7.DB.35CalciocopiapiteCaFe4(SO4)6(OH)2 · 10H2OTric. 1 : P1
7.DB.35CopiapiteFe2+Fe3+4(SO4)6(OH)2 · 20H2OTric. 1 : P1
7.DB.35CuprocopiapiteCuFe4(SO4)6(OH)2 · 20H2OTric. 1 : P1
7.DB.35FerricopiapiteFe5(SO4)6O(OH) · 20H2OTric. 1 : P1
7.DB.35MagnesiocopiapiteMgFe3+4(SO4)6(OH)2 · 20H2OTric. 1 : P1
7.DB.35ZincocopiapiteZnFe3+4(SO4)6(OH)2 · 18H2OTric.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

25.10.1SzomolnokiteFeSO4 · H2OMon. 2/m : B2/b
25.10.2RozeniteFeSO4 · 4H2OMon. 2/m : P21/b
25.10.3SiderotilFeSO4 · 5H2OTric.
25.10.4FerrohexahydriteFeSO4 · 6H2OMon. 2/m : B2/b
25.10.5MelanteriteFe2+(H2O)6SO4 · H2OMon. 2/m : P21/b
25.10.6Rhomboclase(H5O2)Fe3+(SO4)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
25.10.7LauseniteFe2(SO4)3·5H2OMon. 2/m : P21/m
25.10.8KorneliteFe2(SO4)3 · 7H2OMon. 2/m : P21/m
25.10.9CoquimbiteFe2-xAlx(SO4)3 · 9H2O, x ~0.5Trig. 3m (3 2/m) : P3 1c
25.10.10ParacoquimbiteFe2(SO4)3 · 9H2OTrig. 3 : R3
25.10.11QuenstedtiteFe2(SO4)3 · 11H2OTric. 1 : P1
25.10.12FerricopiapiteFe5(SO4)6O(OH) · 20H2OTric. 1 : P1
25.10.14HohmanniteFe3+2(SO4)2O · 8H2OTric. 1
25.10.15ButleriteFe3+(SO4)(OH) · 2H2OMon. 2/m : P21/m
25.10.16ParabutleriteFe3+(SO4)(OH) · 2H2OOrth. mmm (2/m 2/m 2/m)
25.10.17AmarantiteFe3+2(SO4)2O · 7H2OTric. 1
25.10.18FibroferriteFe3+(SO4)(OH) · 5H2OMon.
25.10.19Hydroniumjarosite(H3O)Fe3+3(SO4)2(OH)6Trig. 3m (3 2/m) : R3m
25.10.20RömeriteFe2+Fe3+2(SO4)4 · 14H2OTric. 1 : P1
25.10.21BíliniteFe2+Fe3+2(SO4)4 · 22H2OMon. 2/m : P21/b
25.10.22CopiapiteFe2+Fe3+4(SO4)6(OH)2 · 20H2OTric. 1 : P1

Other InformationHide

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 MetahohmanniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mackintosh, James B. (1889) Notes on some Native Iron Sulphates from Chili. American Journal of Science: 38: 242-245 (material may not be identical to metahohmannite).
Bandy, M.C. (1938) Mineralogy of three sulphate deposits of Northern Chile. American Mineralogist: 23: 669-760.
Ungemach (1935) Bulletin de la Société française de Minéralogie: 58: 97.
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.: 608.
Scordari, F., Ventruti, G., Gualtieri, A.F. (2004) The structure of metahohmannite, Fe23+[O(SO4)2].4H2O, by in situ synchrotron powder diffraction. American Mineralogist: 89: 365-370.

Internet Links for MetahohmanniteHide

Localities for MetahohmanniteHide

ⓘ - 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.
Australia
 
  • South Australia
    • Olary Province
      • Mingary
        • Pine Creek - Mutooroo area
Noble R.J, Just J, Johnson J. E. (1983), Catalogue of South Australian Minerals - 1983, Govenment Printer, South Australia.
Chile
 
  • Antofagasta Region
    • El Loa Province
      • Calama
        • Cerritos Bayos
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: 608.; Kampf, A.R.; Mills, S.J.; Housley, R.M.; Williams, P.A.; Dini, M. (2012): Alcaparrosaite, K3Ti4+Fe3+(SO4)4O(H2O)2, a new hydrophobic Ti4+ sulfate from Alcaparrosa, Chile. Mineralogical Magazine 76, 851-861.
        • Chuquicamata District
American Mineralogist (1938): 23: 748; 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: 608.
          • Toki Cu deposit (Toki Cluster)
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: 608.
  • Tarapacá Region
    • El Tamarugal Province
      • Pampa del Tamarugal
Peter G. Seroka collection
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium; Lavreotiki Municipality)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
          • Kamariza Mines (Kamareza Mines)
            • Hilarion area
Rieck, B., Kolitsch, U., Voudouris, P., Giester, G. and Tzeferis, P. (2018): Weitere Neufunde aus Lavrion, Griechenland. Mineralien-Welt 29 (5), 32-77 (in German).
        • Plaka
          • Plaka Mines
Rieck, B., Kolitsch, U., Voudouris, P., Giester, G. and Tzeferis, P. (2018): Weitere Neufunde aus Lavrion, Griechenland. Mineralien-Welt 29 (5), 32-77 (in German).
USA
 
  • Nebraska
    • Jefferson Co.
      • Fairbury
Chemical Geology Volume 215, Issues 1-4, 15 February 2005, Pages 433-452
Mineral and/or Locality  
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