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Brunogeierite

A valid IMA mineral species
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About BrunogeieriteHide

Formula:
Ge4+Fe2+2O4
Some solid solution towards magnetite: Fe2+Ge4+ = 2Fe3+.
Colour:
Grey-black
Lustre:
Sub-Metallic
Hardness:
5
Specific Gravity:
5.51 (Calculated)
Crystal System:
Isometric
Name:
Named after Dr. Bruno H. Geier (1902-1987), former Chief Mineralogist, Tsumeb Corporation.
Nesogermanate member of the ringwoodite group (Cempírek & Groat 2013).

Compare Unnamed (Iron Germanium Oxide).


Unique IdentifiersHide

Mindat ID:
792
Long-form identifier:
mindat:1:1:792:0
GUID
(UUID V4):
14f77fd3-de85-4b16-ad4d-d109dd284c70

IMA Classification of BrunogeieriteHide

Approved
IMA Formula:
Fe2+2Ge4+O4
Approval year:
1972
First published:
1972
Approval history:
A modification of the end-member formula was accepted in IMA proposal 11A ( CMNC Newsletter 9)

Classification of BrunogeieriteHide

9.AC.15

9 : SILICATES (Germanates)
A : Nesosilicates
C : Nesosilicates without additional anions; cations in octahedral [6] coordination
51.3.3.2

51 : NESOSILICATES Insular SiO4 Groups Only
3 : Insular SiO4 Groups Only with all cations in octahedral [6] coordination
7.11.15

7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

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

Physical Properties of BrunogeieriteHide

Sub-Metallic
Transparency:
Opaque
Colour:
Grey-black
Hardness:
Density:
5.51 g/cm3 (Calculated)

Optical Data of BrunogeieriteHide

Type:
Isotropic
Reflectivity:
WavelengthR
400 nm15.5%
420 nm15.0%
440 nm14.5%
460 nm14.1%
480 nm13.8%
500nm13.6%
520 nm13.4%
540 nm13.3%
560 nm13.2%
580 nm13.1%
600 nm13.0%
620 nm13.0%
640 nm12.9%
660 nm12.8%
680 nm12.8%
700 nm12.8%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 15.5%.
Colour in reflected light:
Grey
Internal Reflections:
Brown

Chemistry of BrunogeieriteHide

Mindat Formula:
Ge4+Fe2+2O4

Some solid solution towards magnetite: Fe2+Ge4+ = 2Fe3+.

Crystallography of BrunogeieriteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 8.409 - 8.416 Å
Unit Cell V:
594.61 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Crystals rare. Usually as crusts or rims on tennantite (Tsumeb) or inclusions in sphalerite or magnetite (France).

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0014558BrunogeieriteWelch M D, Cooper M A, Hawthorne F C (2001) The crystal structure of brunogeierite, Fe2GeO4 spinel Mineralogical Magazine 65 441-4442001Tsumeb, Namibia0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.540 Å(10)
1.484 Å(9)
1.615 Å(7)
2.972 Å(6)
1.095 Å(6)
1.720 Å(4)
1.283 Å(3)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47h : [Near-surface oxidized, dehydrated minerals]

Type Occurrence of BrunogeieriteHide

General Appearance of Type Material:
Crusts, 40-50 microns thick, on tennantite.
Place of Conservation of Type Material:
No designated type material.
Geological Setting of Type Material:
Lower oxidation zone of dolostone-hosted hydrothermal polymetallic ore deposit at 930 m depth, formed by alteration of Ge-rich sulfides.
Associated Minerals at Type Locality:
Reference:
Ottemann, J., Nuber, B. (1972) Brunogeierite, ein germanium-ferritspinell von Tsumeb. Neues Jahrbuch für Mineralogie, Monatshefte: 1972: 263-267.

Synonyms of BrunogeieriteHide

Other Language Names for BrunogeieriteHide

Relationship of Brunogeierite to other SpeciesHide

Other Members of this group:
AhrensiteSiFe2O4Iso. m3m (4/m 3 2/m)
Filipstadite(Fe3+0.5Sb5+0.5)Mn2O4Iso.
Qandilite(Mg,Fe3+)2(Ti,Fe3+,Al)O4Iso. m3m (4/m 3 2/m) : Fd3m
Ringwoodite(Mg,Fe2+)2SiO4Iso. m3m (4/m 3 2/m) : Fd3m
Tegengrenite(Mn3+0.5Sb5+0.5)Mg2O4Trig. 3 : R3
UlvöspinelTiFe2+2O4Iso. m3m (4/m 3 2/m) : Fd3m

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Brunogeierite associated with SphaleriteZnS
2 photos of Brunogeierite associated with SchneiderhöhniteFe2+Fe3+3As3+5O13
1 photo of Brunogeierite associated with QuartzSiO2
1 photo of Brunogeierite associated with ArgutiteGeO2
1 photo of Brunogeierite associated with LudlockitePbFe3+4As3+10O22

Related Minerals - Strunz-mindat GroupingHide

9.AC.AhrensiteSiFe2O4Iso. m3m (4/m 3 2/m)
9.AC.PoirieriteMg2SiO4Orth. mmm (2/m 2/m 2/m) : Pmma
9.AC.05FayaliteFe2+2SiO4Orth. mmm (2/m 2/m 2/m)
9.AC.05ForsteriteMg2SiO4Orth. mmm (2/m 2/m 2/m)
9.AC.05GlaucochroiteCaMn2+SiO4Orth. mmm (2/m 2/m 2/m)
9.AC.05KirschsteiniteCaFe2+SiO4Orth. mmm (2/m 2/m 2/m) : Pnma
9.AC.05Laihunite(Fe2+0.50.5)Fe3+[SiO4]Mon. 2/m : P21/b
9.AC.05LiebenbergiteNi2SiO4Orth. mmm (2/m 2/m 2/m)
9.AC.05TephroiteMn2+2SiO4Orth. mmm (2/m 2/m 2/m) : Pnma
9.AC.10MonticelliteCaMgSiO4Orth. mmm (2/m 2/m 2/m)
9.AC.15Ringwoodite(Mg,Fe2+)2SiO4Iso. m3m (4/m 3 2/m) : Fd3m
9.AC.20ChesnokoviteNa2[SiO2(OH)2] · 8H2OOrth. mmm (2/m 2/m 2/m) : Ibca

Other InformationHide

Magnetism:
Ferromagnetic
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 BrunogeieriteHide

References for BrunogeieriteHide

Localities for BrunogeieriteHide

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 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.
France
 
  • Nouvelle-Aquitaine
    • Pyrénées-Atlantiques
      • Oloron-Sainte-Marie
        • Laruns
Cugerone (2019)
  • Occitanie
    • Ariège
      • Saint-Girons
        • Couflens
F. Aye
        • Sentein
F. Aye
        • Ustou
Lips (2006)
    • Haute-Garonne
Mineralogical Society of America - ...
      • Saint-Gaudens
        • Argut-Dessous
Aye et al. (1978)
F. Aye
        • Bagnères-de-Luchon
F. Aye
F. Aye
F. Aye
        • Melles
Cugerone et al. (2018) +1 other reference
F. Aye +1 other reference
    • Hautes-Pyrénées
      • Argelès-Gazost
        • Lourdes
F. Aye
Kenya
 
  • Tharaka-Nithi County
Waweru (2020)
Namibia (TL)
 
  • Oshikoto Region
    • Tsumeb
Ottemann et al. (1972) +1 other reference
 
and/or  
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