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⇱ Kummerite: Mineral information, data and localities.

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Kummerite

A valid IMA mineral species
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About KummeriteHide

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Formula:
Mn2+Fe3+Al(PO4)2(OH)2 · 8H2O
Crystallochemical formula: Mn2+(H2O)4[Fe3+(OH)(PO4)2Al(OH)(H2O)2](H2O)2
Colour:
Amber yellow
Lustre:
Vitreous
Specific Gravity:
2.34 (Calculated)
Crystal System:
Triclinic
Name:
Named for Rudolf Kummer (1924-1982), mining director of the Cornelia mine at Hagendorf Süd from 1964 until his death in 1982. Rudi had a great appreciation of, and familiarity with the mineral occurrences at the mine and he was very supportive of geologists, mineralogists and collectors who came to study and collect samples from the mine.
Isostructural with:
Chemically similar to rittmannite.

A difference from laueite: Al and Fe3+ are ordered into alternate octahedral sites within chains.


Unique IdentifiersHide

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Mindat ID:
46707
Long-form identifier:
mindat:1:1:46707:0

Similar NamesHide

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GumberiteA rock classification type
HummeriteA valid IMA mineral species - grandfatheredK2Mg2(V10O28) · 16H2O
KomariteA synonym of Willemseite

Classification of KummeriteHide

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👁 05521570017685316117551.jpg
Laueite structure archetype

In kummerite, the M1 site is occupied by Mn2+, the M2 is occupied by Fe3+, and the M3 site is occupied by Al3+. The X site is a phosphate group. Kummerite is unusual in that the other members of the laueite supergroup don't exhibit different site-defining cations between their M2 and M3 sites. This is similar to rittmannite in the jahnsite supergroup.

IMA Classification of KummeriteHide

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Approved
Approval year:
2015
First published:
2016
8.DC.30

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 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.

SymbolSourceReference for Standard
KumIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of KummeriteHide

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Vitreous
Transparency:
Translucent
Colour:
Amber yellow
Streak:
White
Tenacity:
Brittle
Cleavage:
Distinct/Good
Parallel to {010}
Fracture:
Irregular/Uneven
Density:
2.34 g/cm3 (Calculated)

Optical Data of KummeriteHide

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Type:
Biaxial (-)
RI values:
nα = 1.565(5) nβ = 1.600(5) nγ = 1.630(5)
2V:
Calculated: 84°
Max. Birefringence:
δ = 0.065
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.

Surface Relief:
Moderate
Dispersion:
weak
Pleochroism:
Weak
Comments:
amber yellow

Chemistry of KummeriteHide

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Mindat Formula:
Mn2+Fe3+Al(PO4)2(OH)2 · 8H2O

Crystallochemical formula: Mn2+(H2O)4[Fe3+(OH)(PO4)2Al(OH)(H2O)2](H2O)2
Element Weights:
Element% weight
O56.932 %
P12.246 %
Fe11.040 %
Mn10.861 %
Al5.334 %
H3.587 %

Calculated from ideal end-member formula.
Common Impurities:
Mg,Fe(II),(Zn)

Crystallography of KummeriteHide

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Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.320(1) Å, b = 10.670(3) Å, c = 7.139(1) Å
β = 111.40(3)°, γ = 71.84(2)°
Ratio:
a:b:c = 0.499 : 1 : 0.669
Unit Cell V:
nan ų (Calculated from Unit Cell)
Z:
1
Morphology:
Very thin, often deformed laths forming aggregates (spray, rounded)

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
9.885 Å(100)
6.476 Å(20)
4.942 Å(30)
3.988 Å(9)
3.255 Å(8)
3.235 Å(9)
3.116 Å(18)
2.873 Å(11)
Comments:
From Type Description.

Geological EnvironmentHide

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Paragenetic Mode(s):

Type Occurrence of KummeriteHide

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General Appearance of Type Material:
Aggregates are commonly 100 to 500 µm in their longest dimension, but the individual lamellae, parallel to {010} have a thickness of the order of a few µm
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Museum Victoria, Melbourne, Victoria, Australia, registration number M53448
Geological Setting of Type Material:
Pegmatite
Associated Minerals at Type Locality:

Synonyms of KummeriteHide

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Other Language Names for KummeriteHide

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Dutch:Kummeriet
German:Kummerit

Relationship of Kummerite to other SpeciesHide

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Other Members of Laueite Group:
FerrolaueiteFe2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
LaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
SigloiteFe3+Al2(PO4)2(OH)3 · 7H2OTric. 1 : P1
StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1

Common AssociatesHide

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Associations Based on Photo Data:
3 photos of Kummerite associated with StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2O
3 photos of Kummerite associated with FerroberauniteFe2+Fe3+5(PO4)4(OH)5 · 6H2O

Related Minerals - Strunz-mindat GroupingHide

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8.DC.CésarferreiraiteFe2+ Fe3+2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.FerrivauxiteFe3+Al2(PO4)2(OH)3 · 5H2OTric. 1 : P1
8.DC.IanbruceiteZn2(AsO4)(OH) · 3H2OMon. 2/m : P21/b
8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2OMon. 2/m : B2/b
8.DC.07EuchroiteCu2(AsO4)(OH) · 3H2OOrth. 222 : P212121
8.DC.10LegranditeZn2(AsO4)(OH) · H2OMon. 2/m : P21/b
8.DC.12StrashimiriteCu8(AsO4)4(OH)4 · 5H2OMon.
8.DC.15EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15'UM2006-27-PO:FeHZn'ZnFe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15'UKI-2006-(PO:AlCuFeH)'Fe2+Al3+2(PO4)2(OH)2 · 4H2O
8.DC.15CobaltarthuriteCoFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15BendadaiteFe2+Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.17KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
8.DC.20MagnesiobermaniteMgMn3+2(PO4)2(OH)2 · 4H2OMon. 2 : P21
8.DC.20BermaniteMn2+Mn3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P2/b
8.DC.20CoralloiteMn2+Mn3+2(AsO4)2(OH)2 · 4H2OTric. 1 : P1
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2OMon. 2/m : P21/b
8.DC.25ZincostrunziteZnFe3+2(PO4)2(OH)2 · 6.5H2OTric. 1 : P1
8.DC.25MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.25MetavivianiteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
8.DC.25StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25FerrostrunziteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric.
8.DC.27BerauniteFe3+6(PO4)4O(OH)4 · 6H2OMon. m : Bb
8.DC.27TvrdýiteFe2+Fe3+2Al3(PO4)4(OH)5(H2O)4 · 2H2OMon. 2/m : B2/b
8.DC.27ZincoberauniteZnFe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DC.30MaghrebiteMgAl2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30FerrolaueiteFe2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30LaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30SigloiteFe3+Al2(PO4)2(OH)3 · 7H2OTric. 1 : P1
8.DC.30NordgauiteMnAl2(PO4)2(F,OH)2 · 5H2OTric. 1 : P1
8.DC.30Kayrobertsonite[MnAl2(PO4)2(OH)2(H2O)4] · 2H2OTric. 1 : P1
8.DC.30MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30PseudolaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.32KamarizaiteFe3+3(AsO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.32TinticiteFe3+3(PO4)2(OH)3 · 3H2OTric. 1 : P1
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2OOrth.
8.DC.40CacoxeniteFe3+24AlO6(PO4)17(OH)12 · 75H2OHex. 6/m : P63/m
8.DC.45SouzaliteMg3Al4(PO4)4(OH)6 · 2H2OTric. 1
8.DC.45Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.47KingiteAl3(PO4)2F2(OH) · 7H2OTric.
8.DC.50AllanpringiteFe3+3(PO4)2(OH)3 · 5H2OMon. 2/m : P21/m
8.DC.50FluorwavelliteAl3(PO4)2(OH)2F · 5H2OOrth. mmm(2/m2/m2/m)
8.DC.50WavelliteAl3(PO4)2(OH)3 · 5H2OOrth. mmm(2/m2/m2/m)
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
8.DC.55MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon. m : Bm
8.DC.57OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm(2/m2/m2/m) : Cmmm
8.DC.60CloncurryiteCu0.5(VO)0.5Al2(PO4)2F2 · 5H2OMon. 2/m : P21/b
8.DC.60Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2OOrth. mmm(2/m2/m2/m)
8.DC.62KenngottiteMn2+3Fe3+4(PO4)4(OH)6(H2O)2 Mon. 2/m : P2/b
8.DC.67MolinelloiteCu(H2O)(OH)V4+O(V5+O4)Tric. 1 : P1
8.DC.70WhitecapsiteH16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2OHex. 6/m : P63/m
8.DC.75HeimitePbCu2(AsO4)(OH)3 · 2H2OMon. 2/m
8.DC.80LedneviteCu[PO3(OH)] · H2OMon. 2/m : P21/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 KummeriteHide

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mindat.org URL:
https://www.mindat.org/min-46707.html
Please feel free to link to this page.

References for KummeriteHide

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Localities for KummeriteHide

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Showing 2 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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.
Brazil
  • Minas Gerais
    • Galiléia
      • Sapucaia do Norte
Sergio Varvello collection
Germany (TL)
  • Bavaria
    • Upper Palatinate
      • Neustadt an der Waldnaab District
        • Waidhaus
          • Hagendorf
Hålenius et al. (2015) +1 other reference
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