Khademite
A valid IMA mineral species
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About Khademite
Nasrollah Khadem
Formula:
Al(SO4)F · 5H2O
Colour:
Colorless
Specific Gravity:
1.925
Crystal System:
Orthorhombic
Name:
In honour of Nasrollah Khadem (1918, Tehran, Iran – 5 May 1999, Tehran, Iran) [note: other sources give year of birth as 1910], mining engineer and founder and Director of the Geological Survey of Iran.
Unique Identifiers
Mindat ID:
2193
Long-form identifier:
mindat:1:1:2193:3
IMA Classification of Khademite
Approved
First published:
1973
Classification of Khademite
7.DB.10
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
31.9.11.1
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
25.6.3
25 : Sulphates
6 : Sulphates of Al and Tl
25 : Sulphates
6 : Sulphates of Al and Tl
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 |
|---|---|---|
| Kdm | 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 Khademite
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Cleavage:
None Observed
Density:
1.925 g/cm3 (Measured) 1.942 g/cm3 (Calculated)
Optical Data of Khademite
Type:
Biaxial (-)
RI values:
nα = 1.440 nβ = 1.460 nγ = 1.487
2V:
Measured: 68° , Calculated: 84°
Max. Birefringence:
δ = 0.047
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
dispersion not observed
Chemistry of Khademite
Mindat Formula:
Al(SO4)F · 5H2O
Element Weights:
Crystallography of Khademite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 11.17 Å, b = 13.05 Å, c = 10.88 Å
Ratio:
a:b:c = 0.856 : 1 : 0.834
Unit Cell V:
1,585.96 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Forms (010) and (001) (dominant), also (110), (111), and (313).
Comment:
Space group Pcab.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
|---|---|---|---|---|---|---|---|
| 0012072 | Khademite | Bachet B, Cesbron F, Chevalier R (1981) Structure cristalline de la khademite Al(SO4)F*5H2O Bulletin de Mineralogie 104 19-22 | 1981 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.247 Å | (100) |
| 4.179 Å | (71) |
| 3.901 Å | (52) |
| 3.351 Å | (16) |
| 2.741 Å | (16) |
| 2.730 Å | (59) |
| 2.030 Å | (21) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45a : [Sulfates, arsenates, selenates, antimonates] | |
| 45b : [Other oxidized fumarolic minerals] | |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| 47g : [Halogen-bearing surface weathering minerals] | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 50 : Coal and/or oil shale minerals | <0.36 |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 54 : Coal and other mine fire minerals (see also #51 and #56) | |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Khademite
Associated Minerals at Type Locality:
Other Language Names for Khademite
Common Associates
Associated Minerals Based on Photo Data:
| 10 photos of Khademite associated with Halotrichite | FeAl2(SO4)4 · 22H2O |
| 9 photos of Khademite associated with Voltaite | K2Fe2+5Fe3+3Al(SO4)12 · 18H2O |
| 2 photos of Khademite associated with Coquimbite | AlFe3(SO4)6(H2O)12 · 6H2O |
| 2 photos of Khademite associated with Gypsum | CaSO4 · 2H2O |
| 1 photo of Khademite associated with Marcasite | FeS2 |
| 1 photo of Khademite associated with Magnesiocopiapite | MgFe3+4(SO4)6(OH)2 · 20H2O |
| 1 photo of Khademite associated with Melanterite | Fe2+(H2O)6SO4 · H2O |
| 1 photo of Khademite associated with Copiapite | Fe2+Fe3+4(SO4)6(OH)2 · 20H2O |
| 1 photo of Khademite associated with Stibnite | Sb2S3 |
| 1 photo of Khademite associated with Jurbanite | Al(SO4)(OH) · 5H2O |
Related Minerals - Strunz-mindat Grouping
| 7.DB.05 | Svyazhinite | (Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2O |
| 7.DB.05 | Aubertite | CuAl(SO4)2Cl · 14H2O |
| 7.DB.05 | Magnesioaubertite | (Mg,Cu)Al(SO4)2Cl · 14H2O |
| 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 | Anorthominasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.20 | Orthominasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.25 | Bobjonesite | (V4+O)(SO4) · 3H2O |
| 7.DB.27 | Karpovite | Tl2VO(SO4)2(H2O) |
| 7.DB.30 | Metahohmannite | Fe3+2(SO4)2O · 4H2O |
| 7.DB.30 | Hohmannite | Fe3+2(SO4)2O · 8H2O |
| 7.DB.30 | Amarantite | Fe3+2(SO4)2O · 7H2O |
| 7.DB.35 | Calciocopiapite | CaFe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Zincocopiapite | ZnFe3+4(SO4)6(OH)2 · 18H2O |
| 7.DB.35 | Aluminocopiapite | Al2/3Fe3+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 | Magnesiocopiapite | MgFe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Ferricopiapite | Fe3+0.67Fe3+4(SO4)6(OH)2 · 20H2O |
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 Khademite
mindat.org URL:
https://www.mindat.org/min-2193.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Khademite
Reference List:
Cabri, Louis J., Fleischer, Michael, Pabst, Adolf (1981) New Mineral Names. American Mineralogist, 66 (9-10) 1099-1103
Williams, S. A., Cesbron, F. P. (1983) Wilcoxite and lannonite, two new fluosulphates from catron county, New Mexico. Mineralogical Magazine, 47 (342) 37-40 doi:10.1180/minmag.1983.047.342.06
Cesbron, Fabien P., Bayliss, Peter (1988) Mineral nomenclature: khademite. Mineralogical Magazine, 52 (364) 133-134 doi:10.1180/minmag.1988.052.364.16
Jambor, John L., Ercit, Ernst A. J. Burke T. Scott, Grice, Joel D. (1988) New Mineral Names. American Mineralogist, 73 (11-12) 1492-1499
Košek, Filip, Žáček, Vladimír, Škoda, Radek, Laufek, František, Jehlička, Jan (2019) New mineralogical data for khademite (orthorhombic AlSO4F·5H2O) and the story of rostite (orthorhombic AlSO4OH·5H2O) from Libušín near Kladno, the Czech Republic. Journal of Molecular Structure, 1175. 208-213 doi:10.1016/j.molstruc.2018.07.061
Localities for Khademite
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.
Antarctica | |
| Kammerer (2011) |
Bulgaria | |
| Chavdarova et al. (2022) |
Chile | |
| Färber (n.d.) |
Costa Rica | |
| Rodríguez et al. (2017) |
Czech Republic | |
| Žáček et al. (1995) |
| www.handbookofmineralogy.org (n.d.) +1 other reference |
| Jirásek (2001) |
| Dalibor Matýsek |
France | |
| Chollet Pascal Collection |
Germany | |
| Steinkamm et al. (1988) |
| abstract in Book of Abstracts +3 other references |
| Košek (2018) | |
Greece | |
| Rieck (n.d.) |
| Skarpelis et al. (2009) | |
Hungary | |
| HOM Collection +1 other reference |
Iran (TL) | |
| Bariand et al. (1973) +4 other references |
Italy | |
| Russo et al. (2022) |
| Biagioni et al. (2019) +2 other references |
| ... +1 other reference |
Nicaragua | |
| Hynek et al. (2013, March) +1 other reference |
Romania | |
| minerals-of-the-carpathians.eu (2008) |
| Hîrtopanu (1997) +1 other reference |
Russia | |
| Cesnokov et al. (1998) |
Spain | |
| Joan Abella i Creus (Joanabellacreus@gmail.com) |
Tajikistan | |
| Mike Scott S105223 from Cureton from ... |
USA | |
| Williams et al. (1983) +1 other reference |
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Les Vieux Travaux mine, Montdardier, Le Vigan, Gard, Occitanie, France