Jahnsite Group
A group of related mineral species
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About Jahnsite Group
Richard H. Jahns
Formula:
XM1M22M32(H2O)8(OH)2(PO4)4
Name:
The group has its name after the generic name jahnsite, which is named in honor of Richard Henry Jahns (10 March 1915, Los Angeles, California, USA - 31 December 1983, Palo Alto, California, USA), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA.
The Jahnsite group is a group of complex monoclinic phosphates with a general formula XM1M22M32(H2O)8(OH)2(PO4)2. The group is divided into 2 subgroups on the basis of the species defining dominant cation at the M3 site:
Jahnsite Subgroup (M3 = Fe3+)
Whiteite Subgroup (M3 = Al).
The group was established and approved by IMA in 2018 and is broader and includes more minerals than the historically defined "jahnsite group".
The suffix in the name of the minerals in this group indicates sequentially the dominant atom in the X, M1 and M2 positions in the structure.
Jahnsite Subgroup (M3 = Fe3+)
Whiteite Subgroup (M3 = Al).
The group was established and approved by IMA in 2018 and is broader and includes more minerals than the historically defined "jahnsite group".
The suffix in the name of the minerals in this group indicates sequentially the dominant atom in the X, M1 and M2 positions in the structure.
Unique Identifiers
Mindat ID:
39572
Long-form identifier:
mindat:1:1:39572:8
Classification of Jahnsite Group
The jahnsite structure archetype
The structure archetype of jahnsite group minerals, which includes the jahnsite and whiteite subgroups.
IMA Classification of Jahnsite Group
IMA status notes:
IMA Approved Group Name
Approval history:
Established and approved by IMA in april 2018 (Nomenclature proposals).
Chemistry of Jahnsite Group
Mindat Formula:
XM1M22M32(H2O)8(OH)2(PO4)4
Chemical Analysis
Oxide wt%:
| 1 | 2 | |
|---|---|---|
| P2O5 | 34.46 % | 38.84 % |
| SiO2 | 0.07 % | |
| TiO2 | 0.15 % | |
| Al2O3 | 0.97 % | 13.35 % |
| Fe2O3 | 17.68 % | |
| Feo | 5.30 % | |
| MnO | 17.45 % | |
| CaO | 4.54 % | 8.18 % |
| MgO | 2.54 % | 16.47 % |
| FeO | 0.13 % | |
| H2O | 22.32 % | |
| Total: | 83.16 % | 99.29 % |
Sample references:
| ID | Type | Locality | Reference | Notes |
|---|---|---|---|---|
| 1 | P2-CM-27 | Palermo No. 1 Mine, Groton, Grafton County, New Hampshire, USA | Microprobe. Low analytical total is due to presence of OH- and H2O | |
| 2 | Type Specimen | Argentum Mining Co. Mine, Candelaria Mining District, Mineral County, Nevada, USA |
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0018316 | Whiteite-(CaMnMn) | Grey I E, Mumme W G, Neville S M, Wilson N C, Birch W D (2010) Jahnsite - whiteite solid solutions and associated minerals in the phosphate pegmatite at Hagendorf-Sud, Bavaria, Germany Mineralogical Magazine 74 969-978 | 2010 | Hagendorf-Sud, Bavaria, Germany | 0 | 293 | |
| 0004587 | Jahnsite-(NaFeMg) | Kampf A R, Steele I M, Loomis T A (2008) Jahnsite-(NaFeMg), a new mineral from the Tip Top mine, Custer County, South Dakota: Description and crystal structure American Mineralogist 93 940-945 |  | 2008 | Tip Top mine, Custer County, South Dakota | 0 | 293 |
| 0000414 | Jahnsite-(CaMnMg) | Moore P B, Araki T (1974) Jahnsite, CaMnMg2(H2O)8Fe2(OH)2[PO4]4: A novel stereoisomerism of ligands about octahedral corner-chains American Mineralogist 59 964-973 | | 1974 | Tip Top mine, Custer Country, South Dakota, USA | 0 | 293 |
CIF Raw Data - click here to close
Relationship of Jahnsite Group to other Species
Jahnsite Group Members:
| Jahnsite Subgroup | XM1M22M32(H2O)8(OH)2(PO4)4 | |
| 'Jahnsite-(CaFeFe)' | {Ca}{Fe2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. |
| Jahnsite-(CaFeMg) | {Ca}{Fe2+}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| 'Jahnsite-(CaMgMg)' | {Ca}{Mg}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O | |
| Jahnsite-(CaMnFe) | {Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Jahnsite-(CaMnMg) | {Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Jahnsite-(CaMnMn) | {Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Jahnsite-(CaMnZn) | {Ca}{Mn2+}{Zn2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Jahnsite-(MnMnFe) | {Mn2+}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Jahnsite-(MnMnMg) | {Mn2+}{Mn2+}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Jahnsite-(MnMnMn) | {Mn2+}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P21/b |
| Jahnsite-(MnMnZn) | {Mn2+}{Mn2+}{Zn2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Jahnsite-(NaFeMg) | {Na}{Fe3+}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Jahnsite-(NaMnMg) | {(Na,Ca)}{(Mn2+,Fe3+)}{(Mg,Fe3+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Jahnsite-(NaMnMn) | {Na}{Mn2+}{(Mn2+,Fe3+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Keckite | CaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3 · 7H2O | Mon. 2/m : P2/b |
| Whiteite Subgroup | XM1M22M32(H2O)8(OH)2(PO4)4 | |
| Rittmannite | {(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Whiteite-(CaFeMg) | {Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P21/b |
| Whiteite-(CaMgMg) | CaMg3Al2(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Whiteite-(CaMnFe) | CaMnFe2Al2(PO4)4(OH)2 · 8H2O | Mon. 2/m |
| Whiteite-(CaMnMg) | {Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m |
| Whiteite-(CaMnMn) | {Ca}{Mn2+}{Mn2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Whiteite-(MnFeMg) | {(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : P21/b |
| Whiteite-(MnMnMg) | MnMnMg2Al2(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Whiteite-(MnMnMn) | Mn2+Mn2+Mn2+2Al2(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
Click on any node to view relationships. Formula-derived relationship network for the group members above. Use Find related species to add formula-neighbour species outside the current group view. Solid links show inferred chemical differences; dashed violet links show same-formula crystallographic differences. Hydration states are not treated as relationship changes. These relationships do not imply any real-world substitution reactions between these species.
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 Jahnsite Group
mindat.org URL:
https://www.mindat.org/min-39572.html
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References for Jahnsite Group
Reference List:
Moore, Paul Brian, Ito, J. (1974) I. Jahnsite, segelerite, and robertsite, three new transition metal phosphate species. II. Redefinition of overite, an isotype of segelerite. III. Isotypy of robertsite, mitridatite, and arseniosiderite. American Mineralogist, 59 (1-2) 48-59
Localities for Jahnsite Group
Showing 281 localities.
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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.
Sapucaia mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil