Metahohmannite
A valid IMA mineral species - grandfathered
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About Metahohmannite
Formula:
Fe3+2(SO4)2O · 4H2O
Colour:
Orange
Specific Gravity:
2.568 (Calculated)
Crystal System:
Triclinic
Name:
The name is derived from 'meta', for its lower hydration level, and its relationship to hohmannite.
Unique Identifiers
Mindat ID:
2675
Long-form identifier:
mindat:1:1:2675:4
GUID
(UUID V4):
(UUID V4):
eadd8671-30ce-4360-8103-8cd837d69412
IMA Classification of Metahohmannite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Fe3+2O(SO4)2 · 4H2O
Classification of Metahohmannite
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
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
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
25.10.13
25 : Sulphates
10 : Sulphates of Fe alone
25 : Sulphates
10 : Sulphates of Fe alone
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Mhoh | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Metahohmannite
Transparency:
Translucent
Colour:
Orange
Density:
2.568 g/cm3 (Calculated)
Optical Data of Metahohmannite
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.
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.
Chemistry of Metahohmannite
Mindat Formula:
Fe3+2(SO4)2O · 4H2O
Elements listed:
Crystallography of Metahohmannite
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)°
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.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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CIF File Best | x | y | z | a | b | c
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Labels
Console Off | On | Grey | Yellow
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0003421 | Metahohmannite | Scordari F, Ventruti G, Gualtieri A F (2004) The structure of metahohmannite, Fe2[O(SO4)2].4H2O, by in situ synchrotron powder diffraction American Mineralogist 89 365-370 |  | 2004 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.18 Å | (100) |
| 4.27 Å | (71) |
| 3.28 Å | (71) |
| 2.96 Å | (71) |
| 2.70 Å | (71) |
| 2.49 Å | (71) |
| 9.7 Å | (57) |
Comments:
ICDD 39-379. Dehydrated from hohmannite.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47b : [Sulfates and sulfites] |
Type Occurrence of Metahohmannite
General Appearance of Type Material:
Orange powdery material in association with hohmannite.
Place of Conservation of Type Material:
No designated type specimen.
Geological Setting of Type Material:
Dehydration of hohmannite in a desert sulfate deposit.
Associated Minerals at Type Locality:
Other Language Names for Metahohmannite
Common Associates
Associated Minerals Based on Photo Data:
| 3 photos of Metahohmannite associated with Copiapite | Fe2+Fe3+4(SO4)6(OH)2 · 20H2O |
| 2 photos of Metahohmannite associated with Amarantite | Fe3+2(SO4)2O · 7H2O |
| 2 photos of Metahohmannite associated with Fibroferrite | Fe3+(SO4)(OH) · 5H2O |
| 1 photo of Metahohmannite associated with Hohmannite | Fe3+2(SO4)2O · 8H2O |
Related Minerals - Strunz-mindat Grouping
| 7.DB.05 | Aubertite | CuAl(SO4)2Cl · 14H2O |
| 7.DB.05 | Magnesioaubertite | (Mg,Cu)Al(SO4)2Cl · 14H2O |
| 7.DB.05 | Svyazhinite | (Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2O |
| 7.DB.10 | Khademite | Al(SO4)F · 5H2O |
| 7.DB.10 | Rostite | Al(SO4)(OH) · 5H2O |
| 7.DB.15 | Jurbanite | Al(SO4)(OH) · 5H2O |
| 7.DB.20 | Minasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.20 | Orthominasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.20 | Anorthominasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.25 | Bobjonesite | (V4+O)(SO4) · 3H2O |
| 7.DB.27 | Karpovite | Tl2VO(SO4)2(H2O) |
| 7.DB.30 | Amarantite | Fe3+2(SO4)2O · 7H2O |
| 7.DB.30 | Hohmannite | Fe3+2(SO4)2O · 8H2O |
| 7.DB.35 | Aluminocopiapite | Al2/3Fe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Calciocopiapite | CaFe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Copiapite | Fe2+Fe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Cuprocopiapite | Cu2+Fe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Ferricopiapite | Fe3+0.67Fe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Magnesiocopiapite | MgFe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Zincocopiapite | ZnFe3+4(SO4)6(OH)2 · 18H2O |
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.
Internet Links for Metahohmannite
mindat.org URL:
https://www.mindat.org/min-2675.html
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References for Metahohmannite
Reference List:
Ungemach, Henri (1935) Sur certains minéraux sulfatés du Chili. Bulletin de Minéralogie, 58 (3) 97-221 doi:10.3406/bulmi.1935.4369
Bandy, Mark C. (1938) Mineralogy of three sulphate deposits of northern Chile. American Mineralogist, 23 (11) 669-760
Cesbron, Fabien (1964) Contribution à la Minéralogie des sulfates de fer hydratés. Bulletin de Minéralogie, 87 (2) 125-143 doi:10.3406/bulmi.1964.5721
Localities for Metahohmannite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Australia | |
| Noble R.J et al. (1983) |
Chile | |
| Palache et al. (1951) +1 other reference |
| Bandy (1938) +1 other reference |
| Palache et al. (1951) |
| Peter G. Seroka collection |
Greece | |
| Rieck et al. (2018) |
| Rieck et al. (2018) |
USA | |
| Chemical Geology Volume 215 |
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Queténa Mine, Toki Cu deposit, Chuquicamata District, Calama, El Loa Province, Antofagasta, Chile