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.
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
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
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
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 nm | R=15.5% |
| 420 nm | R=15.0% |
| 440 nm | R=14.5% |
| 460 nm | R=14.1% |
| 480 nm | R=13.8% |
| 500nm | R=13.6% |
| 520 nm | R=13.4% |
| 540 nm | R=13.3% |
| 560 nm | R=13.2% |
| 580 nm | R=13.1% |
| 600 nm | R=13.0% |
| 620 nm | R=13.0% |
| 640 nm | R=12.9% |
| 660 nm | R=12.8% |
| 680 nm | R=12.8% |
| 700 nm | R=12.8% |
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+.
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-spacing | Intensity |
|---|---|
| 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. | Ahrensite | Fe2SiO4 |
| 9.AC.05 | Fayalite | Fe22+SiO4 |
| 9.AC.05 | Forsterite | Mg2SiO4 |
| 9.AC.05 | Glaucochroite | CaMn2+SiO4 |
| 9.AC.05 | Kirschsteinite | CaFe2+SiO4 |
| 9.AC.05 | Laihunite | (Fe3+,Fe2+,◻)2SiO4 |
| 9.AC.05 | Liebenbergite | Ni2SiO4 |
| 9.AC.05 | Tephroite | Mn22+SiO4 |
| 9.AC.10 | Monticellite | CaMgSiO4 |
| 9.AC.15 | Ringwoodite | Mg2SiO4 |
| 9.AC.20 | Chesnokovite | Na2SiO2(OH)2 · 8H2O |
| 7.11.1 | Romarchite | SnO |
| 7.11.2 | Cassiterite | SnO2 |
| 7.11.4 | Schoenfliesite | MgSn(OH)6 |
| 7.11.5 | Burtite | CaSn4+(OH)6 |
| 7.11.6 | Vismirnovite | ZnSn(OH)6 |
| 7.11.7 | Wickmanite | Mn2+Sn4+(OH)6 |
| 7.11.8 | Tetrawickmanite | Mn2+Sn4+(OH)6 |
| 7.11.9 | Jeanbandyite | (Fe3+,Mn2+)Sn4+(OH,O)6 |
| 7.11.10 | Natanite | Fe2+Sn4+(OH)6 |
| 7.11.11 | Mushistonite | Cu2+Sn4+(OH)6 |
| 7.11.12 | Ferronigerite-2N1S | (Al,Fe,Zn)2(Al,Sn)6O11(OH) |
| 7.11.13 | Magnesionigerite | |
| 7.11.14 | Argutite | GeO2 |
| 7.11.16 | Stottite | Fe2+Ge4+(OH)6 |
| 7.11.17 | Carboirite | Fe2+Al2GeO5(OH)2 |
| 7.11.18 | Otjisumeite | PbGe4O9 |
| 7.11.19 | Bartelkeite | PbFeGe(Ge2O7)(OH)2 · H2O |
| 7.11.20 | Massicot | PbO |
| 7.11.21 | Litharge | PbO |
| 7.11.22 | Minium | Pb22+Pb4+O4 |
| 7.11.23 | Plattnerite | PbO2 |
| 7.11.24 | Scrutinyite | PbO2 |
| 7.11.25 | Murdochite | Cu12Pb2O15Cl2 |
| 7.11.26 | Macedonite | PbTiO3 |
| 7.11.27 | Cesàrolite | PbMn34+O6(OH)2 |
| 7.11.28 | Coronadite | Pb(Mn64+Mn23+)O16 |
| 7.11.29 | Quenselite | PbMn3+O2(OH) |
| 7.11.30 | Plumboferrite | Pb2(Fe3+,Mn2+,Mg)11O19 |
| 7.11.31 | Magnetoplumbite | PbFe123+O19 |
| 7.11.32 | Senaite | Pb(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
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.
Please feel free to link to this page.
External Links:
Mineral Dealers:
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.
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(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 | |
| Lips, ALW (2006) A review of non-ferrous mineral deposits in Europe - Finalised initial database BRGM/RP -54957 - FR |
| 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 |
| 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 | |
| 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 | |
| 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 |
Namibia (TL) | |
| NJMM (1972), 263 |
Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia