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
GUID
(UUID V4):
(UUID V4):
e6295c35-6bf2-418f-91cd-2b4615f2a4b2
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
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
CIF Raw Data - click here to close
Relationship of Jahnsite Group to other Species
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) | CaFe2+Mg2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| 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) | CaMn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Jahnsite-(MnMnFe) | Mn2+Mn2+Fe2+2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Jahnsite-(MnMnMg) | Mn2+Mn2+Mg2Fe3+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+Zn2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : P2/b |
| Jahnsite-(NaFeMg) | NaFe3+Mg2Fe3+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) | NaMn2+(Mn2+Fe3+)Σ2Fe3+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 |
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
Localities for Jahnsite Group
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.
Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA