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Wilhelmgümbelite

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About WilhelmgümbeliteHide

Carl Wilhelm Ritter von Gümbel
Formula:
ZnFe2+Fe3+3(PO4)3(OH)4(H2O)5·2H2O
Colour:
Light yellow-brown to orange-red
Lustre:
Dull
Specific Gravity:
2.89
Crystal System:
Orthorhombic
Name:
The name is for Dr. Carl Wilhelm von Gümbel (11 February 1823, Dannenfels, Germany - 18 June 1898, Munich, Germany). He was appointed to Munich in 1851 by King Maximilian II to lead the geological studies of the kingdom of Bavaria for more than 47 years. Geological mapping of Bavaria became his life’s work, published in a number of comprehensive volumes that were printed between 1861 and 1891. His second volume "Geognostische Beschreibung des Ostbayerischen Grenzgebirges oder des Bayerischen und Oberpfälzer Waldgebirges", published in 1868, became an essential contribution to the mineralogical and geological investigation of pegmatites and their minerals in the eastern parts of Bavaria.
Isostructural with:
Related to schoonerite - an oxidized form of schoonerite with Mn2+ largely replaced by Fe3+. Chemistry similar to phosphophyllite, plimerite, steinmetzite, zinclipscombite, and zincoberaunite (these minerals have homovalent iron).
Also related to schmidite.

Structural differences from schoonerite: (1) Zn partitioned between two different sites: one 5-coordinated (as in schoonerite), the other tetrahedrally coordinated; (2) partial occupation of one of the Fe sites, probably correlated with the Zn partitioning. The structural formula: [Zn(Mn0.27Fe3+ 0.73)Σ1.0(Zn0.25Fe2+0.15Fe3+0.6)Σ1.0(Zn0.25Fe2+0.45)Σ0.7Fe3+(PO4)3(OH,H2O)9]·2H2O.


Classification of WilhelmgümbeliteHide

Approved
Approval Year:
2015
First Published:
2017

Physical Properties of WilhelmgümbeliteHide

Colour:
Light yellow-brown to orange-red
Streak:
pale yellow-brown
Tenacity:
Brittle
Cleavage:
Perfect
parallel to {010}
Fracture:
Irregular/Uneven
Density:
2.89 g/cm3 (Measured)    2.82 g/cm3 (Calculated)

Optical Data of WilhelmgümbeliteHide

Type:
Biaxial (+)
RI values:
nα = 1.560(2) nβ = 1.669(2) nγ = 1.718(2)
2V:
Measured: 63° (1), Calculated: 65°
Max Birefringence:
δ = 0.158
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak (r>v)
Pleochroism:
Weak
Comments:
Z = orange-brown, Y = yellow-brown, X = light yellow-brown

Chemical Properties of WilhelmgümbeliteHide

Formula:
ZnFe2+Fe3+3(PO4)3(OH)4(H2O)5·2H2O
IMA Formula:
[ZnFe2+Fe3+3(PO4)3(OH)4(H2O)5] · 2H2O
Common Impurities:
Mn(II)

Crystallography of WilhelmgümbeliteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 10.987(3) Å, b = 25.378(13) Å, c = 6.387(6) Å
Ratio:
a:b:c = 0.433 : 1 : 0.252
Unit Cell V:
1,780.87 ų (Calculated from Unit Cell)
Z:
4
Comment:
Space group setting is Pmab

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
12.65(100)
8.339(5)
6.421(14)
6.228(8)
5.098(5)
4.223(30)
3.166(5)
2.111(7)

Occurrences of WilhelmgümbeliteHide

Paragenetic Mode(s):
•  Oxidation

Type Occurrence of WilhelmgümbeliteHide

General Appearance of Type Material:
radiating sprays of needle-like rectangular laths (up to 0.2 mm in length)
Place of Conservation of Type Material:
Museum Victoria, Melbourne, Australia (registration number M53512)
Geological Setting of Type Material:
Phosphate-bearing granite pegmatite (oxidized zone) likely formed from schoonerite.
Associated Minerals at Type Locality:

Synonyms of WilhelmgümbeliteHide

Relationship of Wilhelmgümbelite to other SpeciesHide

Other Members of this group:
Schmidite[Zn2(Fe3+,Mn2+)2Fe3+(PO4)3(OH)3(H2O)6]· 2H2OOrth.
SchooneriteZnMn2+Fe2+2Fe3+(PO4)3(OH)2 · 9H2OOrth. mmm (2/m 2/m 2/m) : Pbam

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 WilhelmgümbeliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grey, I.E., Keck, E., Kampf, A.R., MacRae, C.M., Glenn, A.M., Price, J.R. (2016) Wilhelmgümbelite, IMA 2015-072. CNMNC Newsletter No. 29, February 2016, 200; Mineralogical Magazine: 80: 199–205.
Grey, I., Keck, E., Kampf, A.R., Macrae, C.M., Glenn, A.M., Price, J.R. (2017) Wilhelmgümbelite, [ZnFe2+Fe3+3(PO4)3(OH)4(H2O)5]·2H2O, a new schoonerite-related mineral from the Hagendorf Süd pegmatite, Bavaria. Mineralogical Magazine: 81: 287–296.

Internet Links for WilhelmgümbeliteHide

Localities for WilhelmgümbeliteHide

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., Kampf, A.R., MacRae, C.M., Glenn, A.M. and Price, J.R., 2016. Wilhelmgümbelite, IMA 2015-072. CNMNC Newsletter No. 29, February 2016, 200; Mineralogical Magazine 80, 199–205.
Mineral and/or Locality  
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