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Brunogeierite

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Formula:
Fe22+Ge4+O4
System:
Isometric
Colour:
Grey-black
Lustre:
Sub-Metallic
Hardness:
5
Name:
Named after Dr. Bruno H. Geier (1902-1987), former Chief Mineralogist, Tsumeb Corporation.
Nesogermanate member of the ringwoodite group (Cempírek & Groat 2013).


Classification of Brunogeierite

Approved
Approval Year:
1972
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

Physical Properties of Brunogeierite

Sub-Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Grey-black
Hardness (Mohs):
5
Density:
5.51 g/cm3 (Calculated)

Optical Data of Brunogeierite

Type:
Isotropic
Reflectivity:
400 nmR=15.5%
420 nmR=15.0%
440 nmR=14.5%
460 nmR=14.1%
480 nmR=13.8%
500nmR=13.6%
520 nmR=13.4%
540 nmR=13.3%
560 nmR=13.2%
580 nmR=13.1%
600 nmR=13.0%
620 nmR=13.0%
640 nmR=12.9%
660 nmR=12.8%
680 nmR=12.8%
700 nmR=12.8%

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

Chemical Properties of Brunogeierite

Formula:
Fe22+Ge4+O4

Some solid solution towards magnetite: Fe2+Ge4+ = 2Fe3+.
Elements listed in formula:

Crystallography of Brunogeierite

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

Type Occurrence of Brunogeierite

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.

Relationship of Brunogeierite to other Species

9.AC.AhrensiteFe2SiO4
9.AC.05FayaliteFe22+SiO4
9.AC.05ForsteriteMg2SiO4
9.AC.05GlaucochroiteCaMn2+SiO4
9.AC.05KirschsteiniteCaFe2+SiO4
9.AC.05Laihunite(Fe3+,Fe2+,◻)2SiO4
9.AC.05LiebenbergiteNi2SiO4
9.AC.05TephroiteMn22+SiO4
9.AC.10MonticelliteCaMgSiO4
9.AC.15RingwooditeMg2SiO4
9.AC.20ChesnokoviteNa2SiO2(OH)2 · 8H2O
7.11.1RomarchiteSnO
7.11.2CassiteriteSnO2
7.11.4SchoenfliesiteMgSn(OH)6
7.11.5BurtiteCaSn4+(OH)6
7.11.6VismirnoviteZnSn(OH)6
7.11.7WickmaniteMn2+Sn4+(OH)6
7.11.8TetrawickmaniteMn2+Sn4+(OH)6
7.11.9Jeanbandyite(Fe3+,Mn2+)Sn4+(OH,O)6
7.11.10NataniteFe2+Sn4+(OH)6
7.11.11MushistoniteCu2+Sn4+(OH)6
7.11.12Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)
7.11.13Magnesionigerite
7.11.14ArgutiteGeO2
7.11.16StottiteFe2+Ge4+(OH)6
7.11.17CarboiriteFe2+Al2GeO5(OH)2
7.11.18OtjisumeitePbGe4O9
7.11.19BartelkeitePbFeGe(Ge2O7)(OH)2 · H2O
7.11.20MassicotPbO
7.11.21LithargePbO
7.11.22MiniumPb22+Pb4+O4
7.11.23PlattneritePbO2
7.11.24ScrutinyitePbO2
7.11.25MurdochiteCu12Pb2O15Cl2
7.11.26MacedonitePbTiO3
7.11.27CesàrolitePbMn34+O6(OH)2
7.11.28CoronaditePb(Mn64+Mn23+)O16
7.11.29QuenselitePbMn3+O2(OH)
7.11.30PlumboferritePb2(Fe3+,Mn2+,Mg)11O19
7.11.31MagnetoplumbitePbFe123+O19
7.11.32SenaitePb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38

Other Names for Brunogeierite

Name in Other Languages:

Other Information

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.

References for Brunogeierite

Reference List:
American Mineralogist: 58: 348.

Neues Jahrbuch für Mineralogie, Monatshefte (1972): 263-267.

Cempírek, J. & Groat, L. A. (2013): Note on the formula of brunogeierite and the first bond-valence parameters for Ge2+. Journal of Geosciences, 58, 71-74. http://www.jgeosci.org/content/jgeosci.130_cempirek.pdf

Internet Links for Brunogeierite

mindat.org URL:
https://www.mindat.org/min-792.html
Please feel free to link to this page.

Localities for Brunogeierite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
France
 
  • Occitanie
    • Ariège
Lips, ALW (2006) A review of non-ferrous mineral deposits in Europe - Finalised initial database BRGM/RP -54957 - FR
      • Cauflens
F. Aye, J. Bouladon, P. Picot, G. Pouit : "Quelques exemples d'apport de la minéralogie à la connaissance et à la recherche des gîtes minéraux" , Bull. Mineral. , 1978, 101, 139-147
      • Saint-Girons
F. Aye, J. Bouladon, P. Picot, G. Pouit : "Quelques exemples d'apport de la minéralogie à la connaissance et à la recherche des gîtes minéraux" , Bull. Mineral. , 1978, 101, 139-147
    • Haute-Garonne
      • Argut-Dessus
F. Aye, J. Bouladon, P. Picot, G. Pouit : "Quelques exemples d'apport de la minéralogie à la connaissance et à la recherche des gîtes minéraux" , Bull. Mineral. , 1978, 101, 139-147
F. Aye, J. Bouladon, P. Picot, G. Pouit : "Quelques exemples d'apport de la minéralogie à la connaissance et à la recherche des gîtes minéraux" , Bull. Mineral. , 1978, 101, 139-147
      • Luchon
F. Aye, J. Bouladon, P. Picot, G. Pouit : "Quelques exemples d'apport de la minéralogie à la connaissance et à la recherche des gîtes minéraux" , Bull. Mineral. , 1978, 101, 139-147
F. Aye, J. Bouladon, P. Picot, G. Pouit : "Quelques exemples d'apport de la minéralogie à la connaissance et à la recherche des gîtes minéraux" , Bull. Mineral. , 1978, 101, 139-147
F. Aye, J. Bouladon, P. Picot, G. Pouit : "Quelques exemples d'apport de la minéralogie à la connaissance et à la recherche des gîtes minéraux" , Bull. Mineral. , 1978, 101, 139-147
Handbook of Mineralogy
      • Saint-Béat
        • Plan-du-Rey
          • Couledoux
F. Aye, J. Bouladon, P. Picot, G. Pouit : "Quelques exemples d'apport de la minéralogie à la connaissance et à la recherche des gîtes minéraux" , Bull. Mineral. , 1978, 101, 139-147
    • Hautes-Pyrénées
      • Lourdes
F. Aye, J. Bouladon, P. Picot, G. Pouit : "Quelques exemples d'apport de la minéralogie à la connaissance et à la recherche des gîtes minéraux" , Bull. Mineral. , 1978, 101, 139-147
Namibia (TL)
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
NJMM (1972), 263
Mineral and/or Locality  
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