Jahnsite-(CaFeMg) (original) (raw)
A valid IMA mineral species
About Jahnsite-(CaFeMg)Hide
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Formula:
CaFe2+Mg2Fe3+2(PO4)4(OH)2 · 8H2O
Crystal System:
Monoclinic
Name:
The root name is in honor of Richard Henry Jahns (March 10, 1915 Los Angeles, California, USA - December 31, 1983 Palo Alto, California, USA), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA. The suffix indicates metal site occupancies.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:46052:7
ff172dff-2f0b-4f53-a77b-5fdbd3acf005
IMA Classification of Jahnsite-(CaFeMg)Hide
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Type description reference:
Classification of Jahnsite-(CaFeMg)Hide
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8.DH.15
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
H : With large and medium-sized cations, (OH, etc.):RO4 < 1:1
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Jah-CaFeMg | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Jhn | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Jahnsite-(CaFeMg)Hide
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Cleavage:
Distinct/Good
{001}
Density:
2.76(4) g/cm3 (Measured) 2.772 g/cm3 (Calculated)
Optical Data of Jahnsite-(CaFeMg)Hide
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RI values:
_n_α = 1.629(4) _n_β = 1.658(4) _n_γ = 1.677(4)
δ = 0.048
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Chemistry of Jahnsite-(CaFeMg)Hide
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Mindat Formula:
CaFe2+Mg2Fe3+2(PO4)4(OH)2 · 8H2O
Crystallography of Jahnsite-(CaFeMg)Hide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 14.975(5) Å, b = 7.1645(14) Å, c = 9.928(2) Å
β = 110.65(3)°
Ratio:
a:b:c = 2.09 : 1 : 1.386
Unit Cell V:
996.72 ų (Calculated from Unit Cell)
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.339 Å | (100) |
| 4.923 Å | (20) |
| 3.562 Å | (20) |
| 3.518 Å | (20) |
| 3.453 Å | (20) |
| 2.965 Å | (20) |
| 2.839 Å | (35) |
| 2.592 Å | (20) |
Comments:
From Type Description.
Geological EnvironmentHide
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Type Occurrence of Jahnsite-(CaFeMg)Hide
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General Appearance of Type Material:
Place of Conservation of Type Material:
Type material is deposited in the collections of the South Australian Museum, Adelaide, South Australia, Australia, registration number G34045
Geological Setting of Type Material:
Low-temperature secondary phase
Reference:
Elliott, P. (2016) Jahnsite-(CaFeMg), a new mineral from Tom’s quarry, South Australia: description and crystal structure. European Journal of Mineralogy: 28: 991-996.
Synonyms of Jahnsite-(CaFeMg)Hide
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Relationship of Jahnsite-(CaFeMg) to other SpeciesHide
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Other Members of this group:
Related Minerals - Strunz-mindat GroupingHide
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| 8.DH. | Ferroberaunite | Fe2+Fe3+5(PO4)4(OH)5 · 6H2O | Mon. 2/m : _B_2/b |
|---|---|---|---|
| 8.DH. | Rowleyite | [Na(NH4,K)9Cl4][V5+,4+2(P,As)O8]6 · n[H2O,Na,NH4,K,Cl] | Iso. |
| 8.DH. | Ammoniotinsleyite | (NH4)Al2(PO4)2(OH) · 2H2O | Mon. 2/m : _P_21/m |
| 8.DH. | Thebaite-(NH4) | (NH4)3Al(C2O4)(PO3OH)2(H2O) | Mon. 2/m : _P_21/b |
| 8.DH. | Dendoraite-(NH4) | (NH4)2NaAl(C2O4)(PO3OH)2(H2O)2 | Mon. 2/m |
| 8.DH. | Whiteite-(MnMnMn) | Mn2+Mn2+Mn2+2Al2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH. | Whiteite-(CaMnFe) | CaMnFe2Al2(PO4)4(OH)2 · 8H2O | Mon. 2/m |
| 8.DH. | Hochleitnerite | Mn2Ti3(PO4)4O2(H2O)2 · 14H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH. | Regerite | KFe6(PO4)4(OH)7(H2O)6 · 4H2O | Mon. 2/m : _P_21/b |
| 8.DH.05 | Minyulite | KAl2(PO4)2F · 4H2O | Orth. m _m_2 : P b _a_2 |
| 8.DH.10 | Leucophosphite | KFe3+2(PO4)2(OH) · 2H2O | Mon. 2/m : _P_21/b |
| 8.DH.10 | Spheniscidite | (NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2O | Mon. 2/m |
| 8.DH.10 | Tinsleyite | KAl2(PO4)2(OH) · 2H2O | Mon. |
| 8.DH.15 | Jahnsite-(CaMnFe) | {Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(CaMnMg) | {Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(CaMnMn) | {Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Keckite | CaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3 · 7H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Rittmannite | {(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Whiteite-(CaFeMg) | {Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_21/b |
| 8.DH.15 | Whiteite-(CaMnMg) | {Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m |
| 8.DH.15 | Whiteite-(MnFeMg) | {(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_21/b |
| 8.DH.15 | Jahnsite-(MnMnMn) | {Mn2+}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_21/b |
| 8.DH.15 | Kaluginite | (Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2O | Orth. |
| 8.DH.15 | Jahnsite-(CaFeFe) | {Ca}{Fe2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. |
| 8.DH.15 | Jahnsite-(NaFeMg) | NaFe3+Mg2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(NaMnMg) | {(Na,Ca)}{(Mn2+,Fe3+)}{(Mg,Fe3+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(CaMgMg) | {Ca}{Mg}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O | |
| 8.DH.15 | Whiteite-(CaMnMn) | {Ca}{Mn2+}{Mn2}{Al2}(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Whiteite-(MnMnMg) | MnMnMg2Al2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(MnMnMg) | Mn2+Mn2+Mg2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(MnMnFe) | Mn2+Mn2+Fe2+2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Whiteite-(CaMgMg) | CaMg3Al2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(MnMnZn) | Mn2+Mn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(NaMnMn) | NaMn2+(Mn2+Fe3+)Σ2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.15 | Jahnsite-(CaMnZn) | CaMn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2O | Mon. 2/m : _P_2/b |
| 8.DH.20 | Lun'okite | (Mn,Ca)(Mg,Fe,Mn)Al(PO4)2OH · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.20 | Manganosegelerite | (Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.20 | Overite | CaMgAl(PO4)2(OH) · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.20 | Segelerite | Ca2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P c c a |
| 8.DH.20 | Wilhelmvierlingite | CaMnFe3+(PO4)2(OH) · 2H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.20 | Juonniite | CaMgSc(PO4)2(OH) · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.25 | Calcioferrite | Ca2Fe3+2(PO4)3(OH) · 7H2O | Mon. 2/m : _B_2/b |
| 8.DH.25 | Kingsmountite | Ca3MnFeAl4(PO4)6(OH)4 · 12H2O | Tric. 1 : _P_1 |
| 8.DH.25 | Montgomeryite | Ca4MgAl4(PO4)6(OH)4 · 12H2O | Mon. 2 : _B_2 |
| 8.DH.25 | Zodacite | Ca4Mn2+Fe3+4(PO4)6(OH)4 · 12H2O | Mon. |
| 8.DH.25 | Fanfaniite | Ca4MnAl4(PO4)6(OH)4 · 12H2O | Mon. 2/m : _B_2/b |
| 8.DH.30 | Arseniosiderite | Ca2Fe3+3(AsO4)3O2 · 3H2O | Mon. 2/m : _B_2/b |
| 8.DH.30 | Kolfanite | Ca2Fe3+3O2(AsO4)3 · 2H2O | Mon. |
| 8.DH.30 | Mitridatite | Ca2Fe3+3(PO4)3O2 · 3H2O | Mon. 2/m : _B_2/b |
| 8.DH.30 | Pararobertsite | Ca2Mn3+3(PO4)3O2 · 3H2O | Mon. 2/m : _P_21/b |
| 8.DH.30 | Robertsite | Ca2Mn3+3(PO4)3O2 · 3H2O | Mon. m : B b |
| 8.DH.30 | Sailaufite | (Ca,Na,◻)2Mn3+3(AsO4)2(CO3)O2 · 3H2O | Mon. m : B m |
| 8.DH.35 | Mantienneite | KMg2Al2Ti(PO4)4(OH)3 · 15H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.35 | Paulkerrite | K(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O | Mon. m |
| 8.DH.35 | Benyacarite | (H2O)2Mn2Ti2Fe3+(PO4)4(OF)(H2O)10 · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.35 | Hydroxylbenyacarite | (H2O)2Mn2(Ti2Fe)(PO4)4[O(OH)](H2O)10 · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 8.DH.35 | Macraeite | K(H2O)Mn2(Fe2Ti)(PO4)4[O(OH)](H2O)10 · 4H2O | Mon. 2/m : _P_21/b |
| 8.DH.35 | Sperlingite | (H2O)K(Mn2+Fe3+)(Al2Ti)(PO4)4[O(OH)] [(H2O)9(OH)] · 4H2O | Mon. 2/m : _P_21/b |
| 8.DH.40 | Xanthoxenite | Ca4Fe3+2(PO4)4(OH)2 · 3H2O | Tric. 1 : _P_1 |
| 8.DH.45 | Mahnertite | NaCu3(AsO4)2Cl · 5H2O | Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _I_4/m m m |
| 8.DH.50 | Andyrobertsite | KCdCu5(AsO4)4(H2AsO4) · 2H2O | Mon. 2/m : _P_21/m |
| 8.DH.50 | Calcioandyrobertsite | KCaCu5(AsO4)4(H2AsO4) · 2H2O | Mon. 2/m : _P_21/m |
| 8.DH.55 | Englishite | K3Na2Ca10Al15(PO4)21(OH)7 · 26H2O | Mon. 2/m |
| 8.DH.60 | Bouazzerite | Bi6(Mg,Co)11Fe3+14(AsO4)18(OH)4O12 · 86H2O | Mon. 2/m |
| 8.DH.65 | Galliskiite | Ca4Al2(PO4)2F8 · 5H2O | Tric. 1 : _P_1 |
| 8.DH.70 | Joteite | Ca2CuAl(AsO4)[AsO3(OH)]2(OH)2 · 5H2O | Tric. 1 : _P_1 |
| 8.DH.75 | Kampelite | Ba6Mg3Sc8(PO4)12(OH)6 · 7H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 8.DH.80 | Kapundaite | NaCaFe4(PO4)4(OH)3 · 5H2O | Tric. 1 : _P_1 |
| 8.DH.85 | Vaniniite | Ca2Mn2+3Mn3+2O2(AsO4)4 · 2H2O | Mon. 2/m : _P_21/b |
Other InformationHide
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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-(CaFeMg)Hide
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References for Jahnsite-(CaFeMg)Hide
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Localities for Jahnsite-(CaFeMg)Hide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- 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). 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
| Antarctica | |
|---|---|
| Eastern Antarctica Princess Elizabeth Land Ingrid Christensen Coast Prydz Bay Larsemann Hills Stornes Peninsula ⓘ Johnston Firth | Grew et al. (2007) |
| Australia (TL) | |
| South Australia Light Regional Council Koonunga ⓘ Tom's Quarry (TL) | Williams et al. (2014) +2 other references |