Kenngottite
A valid IMA mineral species
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About Kenngottite
Formula:
Mn2+3Fe3+4(PO4)4(OH)6(H2O)2
Colour:
brown
Lustre:
Vitreous, Pearly
Hardness:
4 - 5
Specific Gravity:
3.40 (Calculated)
Crystal System:
Monoclinic
Name:
Named for Prof. Gustav Adolf Kenngott (6 January 1818 in Breslau (now Wrocław) - 4 March 1897 in Lugano), a mineralogist who worked at the University of Zurich, Switzerland, in recognition of his work on systematic mineralogy.
Structurally related to (triclinic minerals) souzalite and gormanite.
Identical to phase UNK9 (Unknown no. 9) of Sejkora et al. (2006).
Associates also include a K-Mn oxide.
The structure is based on trimeric clusters made of face-shared octahedra (Mn–Fe–Mn). By sharing edges with Mn-centred octahedra the octahedra comprise chains running along [001]. The chains connect at their corners along [100] to form linear corner-shared trimers of Fe-centred octahedra. Second connetion of the chains is with corner-connected PO4 tetrahedra, along [010].
Identical to phase UNK9 (Unknown no. 9) of Sejkora et al. (2006).
Associates also include a K-Mn oxide.
The structure is based on trimeric clusters made of face-shared octahedra (Mn–Fe–Mn). By sharing edges with Mn-centred octahedra the octahedra comprise chains running along [001]. The chains connect at their corners along [100] to form linear corner-shared trimers of Fe-centred octahedra. Second connetion of the chains is with corner-connected PO4 tetrahedra, along [010].
Unique Identifiers
Mindat ID:
53374
Long-form identifier:
mindat:1:1:53374:4
GUID
(UUID V4):
(UUID V4):
58bd1538-c4c5-46c3-838a-ebcdd1abe2fa
IMA Classification of Kenngottite
Classification of Kenngottite
8.DC.62
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
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 |
---|---|---|
Kgt | 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 Kenngottite
Vitreous, Pearly
Transparency:
Transparent, Translucent, Opaque
Colour:
brown
Comment:
crystals are transparent to translucent; aggregates are opaque
Streak:
light brown
Hardness:
4 - 5 on Mohs scale
Comment:
ca., by analogy with souzalite and gormanite
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
3.40 g/cm3 (Calculated)
Chemistry of Kenngottite
Mindat Formula:
Mn2+3Fe3+4(PO4)4(OH)6(H2O)2
Crystallography of Kenngottite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/a
Cell Parameters:
a = 13.909(10) Å, b = 5.186(4) Å, c = 12.159(9) Å
β = 98.88(1)°
β = 98.88(1)°
Ratio:
a:b:c = 2.682 : 1 : 2.345
Unit Cell V:
866.54 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.87 Å | (47) |
3.458 Å | (89) |
3.209 Å | (100) |
3.023 Å | (31) |
2.623 Å | (46) |
2.429 Å | (49) |
1.951 Å | (28) |
1.577 Å | (34) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23) | |
High-𝑇 alteration and/or metamorphism | |
31 : Thermally altered carbonate, phosphate, and iron formations | |
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Kenngottite
General Appearance of Type Material:
imperfect laths to fibers, to 0.5 mm in size, forming, aggregates up to 3 mm across
Place of Conservation of Type Material:
collections of (1) the Department of Mineralogy and Petrology, National Museum Prague, Cirkusová 1740, CZ-193 00 Praha 9, Czech Republic, catalogue number P1P 26/2018 (holotype), and (2) the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 66795 (cotype)
Geological Setting of Type Material:
tiny cavities of hydrothermally altered rockbridgeite-group minerals
Associated Minerals at Type Locality:
Synonyms of Kenngottite
Related Minerals - Strunz-mindat Grouping
8.DC. | Ianbruceite | Zn2(AsO4)(OH) · 3H2O |
8.DC. | Césarferreiraite | Fe2+ Fe3+2(AsO4)2(OH)2 · 8H2O |
8.DC. | Ferrivauxite | Fe3+Al2(PO4)2(OH)3 · 5H2O |
8.DC.05 | Nissonite | Cu2Mg2(PO4)2(OH)2 · 5H2O |
8.DC.07 | Euchroite | Cu2(AsO4)(OH) · 3H2O |
8.DC.10 | Legrandite | Zn2(AsO4)(OH) · H2O |
8.DC.12 | Strashimirite | Cu8(AsO4)4(OH)4 · 5H2O |
8.DC.15 | Arthurite | CuFe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Earlshannonite | Mn2+Fe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | Ojuelaite | ZnFe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Whitmoreite | Fe2+Fe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | Cobaltarthurite | (Co,Mg)Fe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Bendadaite | Fe2+Fe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Kunatite | CuFe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | UM2006-27-PO:FeHZn | ZnFe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | UKI-2006-(PO:AlCuFeH) | Fe2+Al3+2(PO4)2(OH)2 · 4H2O |
8.DC.17 | Kleemanite | ZnAl2(PO4)2(OH)2 · 3H2O |
8.DC.20 | Bermanite | Mn2+Mn3+2(PO4)2(OH)2 · 4H2O |
8.DC.20 | Coralloite | Mn2+Mn3+2(AsO4)2(OH)2 · 4H2O |
8.DC.20 | Magnesiobermanite | MgMn3+2(PO4)2(OH)2 · 4H2O |
8.DC.22 | Kovdorskite | Mg2(PO4)(OH) · 3H2O |
8.DC.25 | Ferristrunzite | Fe3+Fe3+2(PO4)2(OH)3 · 5H2O |
8.DC.25 | Ferrostrunzite | Fe2+Fe3+2(PO4)2(OH)2 · 6H2O |
8.DC.25 | Metavauxite | Fe2+Al2(PO4)2(OH)2 · 8H2O |
8.DC.25 | Metavivianite | Fe2+Fe3+2(PO4)2(OH)2 · 6H2O |
8.DC.25 | Strunzite | Mn2+Fe3+2(PO4)2(OH)2 · 6H2O |
8.DC.25 | Zincostrunzite | ZnFe3+2(PO4)2(OH)2 · 6.5H2O |
8.DC.27 | Beraunite | Fe3+6(PO4)4O(OH)4 · 6H2O |
8.DC.27 | Tvrdýite | Fe2+Fe3+2 Al3(PO4)4(OH)5(H2O)4 · 2H2O |
8.DC.27 | Zincoberaunite | ZnFe3+5(PO4)4(OH)5 · 6H2O |
8.DC.30 | Gordonite | MgAl2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Laueite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Mangangordonite | Mn2+Al2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Paravauxite | Fe2+Al2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Pseudolaueite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Sigloite | Fe3+Al2(PO4)2(OH)3 · 7H2O |
8.DC.30 | Stewartite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Ushkovite | MgFe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Ferrolaueite | Fe2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Kastningite | (Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Maghrebite | MgAl2(AsO4)2(OH)2 · 8H2O |
8.DC.30 | Nordgauite | MnAl2(PO4)2(F,OH)2 · 5H2O |
8.DC.30 | Kayrobertsonite | [MnAl2(PO4)2(OH)2(H2O)4] · 2H2O |
8.DC.30 | Kummerite | Mn2+Fe3+Al(PO4)2(OH)2 · 8H2O |
8.DC.32 | Tinticite | Fe3+3(PO4)2(OH)3 · 3H2O |
8.DC.32 | Kamarizaite | Fe3+3(AsO4)2(OH)3 · 3H2O |
8.DC.35 | Vauxite | Fe2+Al2(PO4)2(OH)2 · 6H2O |
8.DC.37 | Vantasselite | Al4(PO4)3(OH)3 · 9H2O |
8.DC.40 | Cacoxenite | Fe3+24AlO6(PO4)17(OH)12 · 75H2O |
8.DC.45 | Gormanite | (Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O |
8.DC.45 | Souzalite | (Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O |
8.DC.47 | Kingite | Al3(PO4)2F2(OH) · 7H2O |
8.DC.50 | Wavellite | Al3(PO4)2(OH,F)3 · 5H2O |
8.DC.50 | Allanpringite | Fe3+3(PO4)2(OH)3 · 5H2O |
8.DC.50 | Fluorwavellite | Al3(PO4)2(OH)2F · 5H2O |
8.DC.52 | Kribergite | Al5(PO4)3(SO4)(OH)4 · 4H2O |
8.DC.55 | Mapimite | Zn2Fe3+3(AsO4)3(OH)4 · 10H2O |
8.DC.57 | Ogdensburgite | Ca2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2O |
8.DC.60 | Nevadaite | (Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2O |
8.DC.60 | Cloncurryite | Cu0.5(VO)0.5Al2(PO4)2F2 · 5H2O |
8.DC.67 | Molinelloite | Cu(H2O)(OH)V4+O(V5+O4) |
8.DC.70 | Whitecapsite | H16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2O |
8.DC.75 | Heimite | PbCu2(AsO4)(OH)3 · 2H2O |
8.DC.80 | Lednevite | Cu[PO3(OH)] · H2O |
Fluorescence of Kenngottite
non-fluorescent
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 Kenngottite
mindat.org URL:
https://www.mindat.org/min-53374.html
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References for Kenngottite
Reference List:
Miyawaki, Ritsuro, Hålenius, Ulf, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2019) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) NEWSLETTER 47. European Journal of Mineralogy, 31 (1) 197-202 doi:10.1127/ejm/2019/0031-2839
Sejkora, Jiří, Grey, Ian E., Kampf, Anthony R. (2019) Kenngottite, Mn2+3Fe3+4(PO4)4(OH)6(H2O)2: a new phosphate mineral from Krásno near Horní Slavkov, Czech Republic. European Journal of Mineralogy, 31 (3) 629-636 doi:10.1127/ejm/2019/0031-2855
Keck, Erich, Grey, Ian E., MacRae, Colin M., Boer, Stephanie, Hochleitner, Rupert, Rewitzer, Christian, Mumme, William G., Glenn, A. Matt, Davidson, Cameron (2022) New secondary phosphate mineral occurrences and their crystal chemistry, at the Hagendorf Süd pegmatite, Bavaria. European Journal of Mineralogy, 34 (5) 439-450 doi:10.5194/ejm-34-439-2022
Localities for Kenngottite
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).
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.
All localities listed without proper references should be considered as questionable.
Brazil | |
| XRD and EDX analysis Thomas Witzke. |
Czech Republic (TL) | |
| Sejkora et al. (2019) +1 other reference |
Germany | |
| Keck et al. (2022) +1 other reference |
Quick NavTopAbout KenngottiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Serra Branca pegmatite, Pedra Lavrada, Paraíba, Brazil