Keckite (original) (raw)
A valid IMA mineral species
About KeckiteHide
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Formula:
CaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3 · 7H2O
Colour:
Golden brown, orange brown
Lustre:
Sub-Vitreous, Resinous
Crystal System:
Monoclinic
Name:
Named by Arno Mücke in 1979 in honor of Erich Keck (b. 1938) of Germany, mineral collector specializing in Hagendorf minerals. His large collection of Hagendorf minerals is now preserved at Mineralogische Staatssammlung, Munich, Germany.
A member of the jahnsite group which contains trivalent iron not only at the C site but also at the B site.
Note: According to Hochleitner & Fehr (2010), keckite from Hagendorf forms golden-yellow to orange fibrous crusts which are intimately associated with rockbridgeite-frondelite. Specimens showing distinct "keckite" crystals in collections were found to be always either jahnsite-(CaMnFe) or jahnsite-(CaMnMn).
Compare Jahnsite-(CaMnFe).
Possibly intermediate between Jahnsite-(CaMnMn) and Jahnsite-(CaMnFe) and not a valid species, requires investigation into valance state and occupancy of the Fe.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:2174:2
8a72b7c0-dd22-4531-9530-0c6abe4e6e50
IMA Classification of KeckiteHide
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IMA Formula:
CaMn(Fe3+,Mn)2Fe3+2(PO4)4(OH)3 · 7H2O
Type description reference:
Classification of KeckiteHide
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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
42.11.4.1
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
19.12.44
19 : Phosphates
12 : Phosphates of Mn
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.
| Symbol | Source | Reference |
|---|---|---|
| Kec | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of KeckiteHide
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Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Sorry, your browser doesn't support HTML5 audio. | Jolyon Ralph | United Kingdom |
Physical Properties of KeckiteHide
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Transparency:
Transparent, Translucent
Colour:
Golden brown, orange brown
Comment:
Possibly sore are red brown, but these tend to be other jahnsites.
Cleavage:
Distinct/Good
{001}, {100}
Fracture:
Irregular/Uneven, Splintery
Density:
2.6 g/cm3 (Measured) 2.682 g/cm3 (Calculated)
Optical Data of KeckiteHide
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Dispersion:
weak to distinct
Optical Extinction:
X ^ c = 15-20 degrees
Comments:
X reddish brown, Y yellow, Z bright yellow
Comments:
Undulatory extinction; Birefringence probably similar to other jahnsites
Chemistry of KeckiteHide
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Mindat Formula:
CaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3 · 7H2O
Crystallography of KeckiteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 15.02 Å, b = 7.19 Å, c = 19.74 Å
β = 110.5°
Ratio:
a:b:c = 2.089 : 1 : 2.745
Unit Cell V:
1,996.80 ų (Calculated from Unit Cell)
Morphology:
Tightly clustered bladed to stout crystals arranged in subparallel groups.
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.3 Å | (80) |
| 4.98 Å | (50) |
| 4.63 Å | (30) |
| 3.51 Å | (50) |
| 2.86 Å | (100) |
| 2.59 Å | (40) |
| 2.34 Å | (30) |
| 1.879 Å | (40) |
Geological EnvironmentHide
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Type Occurrence of KeckiteHide
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General Appearance of Type Material:
Crusts of yellow-brown to golden brown indistinct crystals.
Geological Setting of Type Material:
Late stage oxidized mineralization in secondary phosphate-rich granite pegmatites.
Associated Minerals at Type Locality:
Reference:
Mücke, A. (1979) Keckit, (Ca,Mg)(Mn,Zn)2Fe3+3[(OH)3|(PO4)4]·2H2O, ein neues Mineral von Hagendorf/Opf. und seine genetische Stellung. Neues Jahrbuch für Mineralogie, Abhandlungen: 134: 183-192.
Synonyms of KeckiteHide
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Other Language Names for KeckiteHide
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Relationship of Keckite to other SpeciesHide
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Other Members of this group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
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 | 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-(CaFeMg) | CaFe2+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 |
Fluorescence of KeckiteHide
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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 KeckiteHide
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References for KeckiteHide
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Reference List:
Fleischer, Michael, Burns, Roger G., Cabri, Louis J., Chao, George Y., Hogarth, D. D., Pabst, Adolf (1979) New Mineral Names. American Mineralogist, 64 (11-12) 1329-1334
Localities for KeckiteHide
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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.
| Australia | |
|---|---|
| Victoria East Gippsland Shire Glen Valley ⓘ Unnamed Pegmatite | Dr. Bill Birch - Museum Victoria |
| DR Congo | |
| South Kivu Mwenga Territory ⓘ Kobokobo pegmatite | Mills et al. (2010) |
| Germany | |
| Bavaria Lower Bavaria Regen District Zwiesel Rabenstein ⓘ Hühnerkobel Mine (Hennenkobel Mine) | Weiß (1990) |
| Upper Palatinate Neustadt an der Waldnaab District Pleystein ⓘ Trutzhofmühle | Dill et al. (2008) |
| Waidhaus ⓘ Hagendorf | Dill (2009) |
| ⓘ Hagendorf South Pegmatite (TL) | Neues Jahrb.Min. (1979) +2 other references |
| ⓘ Silbergrube ? | Wittern (2001) +1 other reference |
| Portugal | |
| Guarda Gouveia Folgosinho ⓘ Sítio do Castelo Mine | |
| Sabugal Bendada ⓘ Bendada Mines | Schnorrer-Köhler (1991) |
| Spain | |
| Castile and Leon Salamanca Navasfrías ⓘ Salmantina Mine | www.foro-minerales.com (n.d.) |
| USA | |
| New Hampshire Grafton County Groton ⓘ Palermo No. 1 Mine | Whitmore et al. (2004) +2 other references |