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Kummerite

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About KummeriteHide

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.


Classification of KummeriteHide

Approved
Approval Year:
2015
First Published:
2016

Physical Properties of KummeriteHide

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

Type:
Biaxial (-)
RI values:
nα = 1.565(5) nβ = 1.600(5) nγ = 1.630(5)
2V:
Calculated: 84°
Max Birefringence:
δ = 0.065
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak
Pleochroism:
Weak
Comments:
amber yellow

Chemical Properties of KummeriteHide

Formula:
Mn2+Fe3+Al(PO4)2(OH)2·8H2O

Crystallochemical formula: Mn2+(H2O)4[Fe3+(OH)(PO4)2Al(OH)(H2O)2](H2O)2
IMA Formula:
Mn2+Fe3+Al(PO4)2(OH)2 · 8H2O
Common Impurities:
Mg,Fe(II),(Zn)

Crystallography of KummeriteHide

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

Warning: deg2rad() expects parameter 1 to be float, string given in /home/mindat/www/include.php on line 9261
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

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

Occurrences of KummeriteHide

Paragenetic Mode(s):

Type Occurrence of KummeriteHide

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

Relationship of Kummerite to other SpeciesHide

Other Members of this 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.
ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
SigloiteFe3+Al2(PO4)2(OH)3 · 7H2OTric.
UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for KummeriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grey, I.E., Keck, E., Mumme, W.G., Pring, A., MacRae, C.M., Shanks, F.L. and Price, J.R. (2015) Kummerite, IMA 2015- 036. CNMNC Newsletter No. 26, August 2015, page 946; Mineralogical Magazine, 79, 941-947.
Grey, I.E., Keck, E., Mumme, W.G., Pring, A., Macrae, C.M., Glenn, A.M., Shanks, F.L., Mills, S.J. (2016): Kummerite, Mn2+Fe3+Al(PO4)2(OH)2·8H2O, a new laueite-group mineral from the Hagendorf Süd pegmatite, Bavaria, with ordering of Al and Fe3+. Mineralogical Magazine, 80, 1243-1254.

Internet Links for KummeriteHide

Localities for KummeriteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany (TL)
 
  • Bavaria
    • Upper Palatinate
      • Waidhaus
        • Hagendorf
Grey, I.E., Keck, E., Mumme, W.G., Pring, A., MacRae, C.M., Shanks, F.L. and Price, J.R. (2015) Kummerite, IMA 2015- 036. CNMNC Newsletter No. 26, August 2015, page 946; Mineralogical Magazine, 79, 941-947; Grey, I.E., Keck, E., Mumme, W.G., Pring, A., Macrae, C.M., Glenn, A.M., Shanks, F.L., Mills, S.J. (2016): Kummerite, Mn2+Fe3+Al(PO4)2(OH)2·8H2O, a new laueite-group mineral from the Hagendorf Süd pegmatite, Bavaria, with ordering of Al and Fe3+. Mineralogical Magazine, 80, 1243-1254.
Mineral and/or Locality  
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