Medenbachite
A valid IMA mineral species
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About Medenbachite
Olaf Medenbach
Formula:
Bi2Fe3+Cu2+(AsO4)2O(OH)3
Endmember formula; Cu may be replaced by minor Fe3+.
Colour:
Yellow to brown-yellow
Lustre:
Adamantine, Vitreous
Hardness:
4½
Specific Gravity:
5.90 (Calculated)
Crystal System:
Triclinic
Name:
Named by W. Krause, H.-J. Bernhardt, W. Gebert, H. Graetsch, K. Belendorff, and K. Petitjean in 1996 in honor of Olaf Medenbach (1949 – ), mineralogist, Ruhr University, Bochum, Germany. He has authored/coauthored descriptions of about 50 new minerals.
Unique Identifiers
Mindat ID:
2625
Long-form identifier:
mindat:1:1:2625:9
GUID
(UUID V4):
(UUID V4):
609ee352-91ff-4b89-9c8f-deb9d8384ff2
IMA Classification of Medenbachite
Approved
Approval year:
1993
First published:
1996
Type description reference:
Classification of Medenbachite
8.BK.10
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
K : With medium-sized and large cations, (OH, etc.):RO4 = 2:1, 2.5:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
K : With medium-sized and large cations, (OH, etc.):RO4 = 2:1, 2.5:1
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Mdb | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Medenbachite
Adamantine, Vitreous
Transparency:
Transparent, Translucent
Colour:
Yellow to brown-yellow
Hardness:
4½ on Mohs scale
Hardness:
VHN25=420 kg/mm2 - Vickers
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
5.90 g/cm3 (Calculated)
Optical Data of Medenbachite
Type:
Biaxial (-)
RI values:
nα = 2.030 nβ = 2.090 nγ = 2.100
2V:
Measured: 43° , Calculated: 42°
Max Birefringence:
δ = 0.070
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v
Chemistry of Medenbachite
Mindat Formula:
Bi2Fe3+Cu2+(AsO4)2O(OH)3
Endmember formula; Cu may be replaced by minor Fe3+.
Endmember formula; Cu may be replaced by minor Fe3+.
Crystallography of Medenbachite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 4.57 Å, b = 6.162 Å, c = 8.993 Å
α = 94.56°, β = 99.69°, γ = 94.28°
α = 94.56°, β = 99.69°, γ = 94.28°
Ratio:
a:b:c = 0.742 : 1 : 1.459
Unit Cell V:
247.842 ų
Z:
1
Morphology:
The crystals are tabular on {-101} and slightly elongated parallel to [111]. They exhibit two main zones: One is parallel to [111] and includes {-101}, {-110},
{0-11}, and the other is parallel to [010] and includes {-101}, {101}, and {001}.
{0-11}, and the other is parallel to [010] and includes {-101}, {101}, and {001}.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0001790 | Medenbachite | Krause W, Bernhardt H J, Gebert W, Graetsch H, Belendorff K, Petitjean K (1996) Medenbachite, Bi2Fe(Cu,Fe)(O,OH)2(OH)2(AsO4)2, a new mineral species: Its description and crystal structure American Mineralogist 81 505-512 |  | 1996 | 0 | 293 | |
| 0001791 | Medenbachite | Krause W, Bernhardt H J, Gebert W, Graetsch H, Belendorff K, Petitjean K (1996) Medenbachite, Bi2Fe(Cu,Fe)(O,OH)2(OH)2(AsO4)2, a new mineral species: Its description and crystal structure American Mineralogist 81 505-512 | | 1996 | 0 | 293 | |
| 0002817 | Medenbachite | Krause W, Bernhardt H J, McCammon C A, Effenberger H (2002) Neustadtelite and cobaltneustadtelite, the Fe- and Co- analogues of medenbachite American Mineralogist 87 726-738 | | 2002 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.82 Å | (60) |
| 5.26 Å | (40) |
| 3.749 Å | (100) |
| 3.596 Å | (80) |
| 3.468 Å | (60) |
| 2.903 Å | (70) |
| 2.685 Å | (50) |
| 2.558 Å | (40) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Medenbachite
General Appearance of Type Material:
Very small, intergrown, tabular crystals up to 0.2 mm in length, often forming aggregates of parallel intergrowths, which crystallize within cavernous quartz.
Place of Conservation of Type Material:
Institut fur Mineralogie, Ruhr-Universitiit Bochum, Germany
Geological Setting of Type Material:
Weathering of small ore impregnations in a silicified barite vein.
Associated Minerals at Type Locality:
Reference:
Krause, W., Bernhardt, H.-J., Gebert, W., Graetsch, H., Belendorff, K., Petitjean, K. (1996) Medenbachite, Bi2Fe(Cu,Fe)(O,OH)2(OH)2(AsO4)2, a new mineral species: its description and crystal structure. American Mineralogist: 81: 505-512.
Synonyms of Medenbachite
Other Language Names for Medenbachite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.BK.05 | Brazilianite | NaAl3(PO4)2(OH)4 |
| 8.BK.10 | Neustädtelite | Bi2Fe3+(Fe3+,Co)(AsO4)2(O,OH)4 |
| 8.BK.10 | Cobaltneustädtelite | Bi2Fe3+(Co,Fe3+)(AsO4)2(O,OH)4 |
| 8.BK.15 | Curetonite | Ba(Al,Ti)(PO4)(OH,O)F |
| 8.BK.20 | Heyite | Pb5Fe2+2(VO4)2O4 |
| 8.BK.25 | Jamesite | Pb2Zn(Fe2+,Zn)2Fe3+4(AsO4)4(OH)10 |
| 8.BK.25 | Lulzacite | Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10 |
| 8.BK.30 | Nishanbaevite | KAl2O(AsO4)(SO4) |
| 8.BK.35 | Lehmannite | Na18Cu12TiO8(AsO4)8FCl5 |
Fluorescence of Medenbachite
None
Other Information
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 Medenbachite
mindat.org URL:
https://www.mindat.org/min-2625.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Medenbachite
Reference List:
Krause, Werner, Bernhardt, Heinz-Juergen, Gebert, Walter, Graetsch, Heribert, Belendorff, Klaus, Petitjean, Klaus (1996) Medenbachite, Bi2Fe(Cu,Fe)(O,OH)2(OH)2(AsO4)2, a new mineral species; its description and crystal structure. American Mineralogist, 81 (3) 505-512 doi:10.2138/am-1996-3-424
Localities for Medenbachite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Germany | |
| Lapis 21 (12) |
| W. Krause at al.: Am. Mineral. 81:505-512 (1996) |
| S Wolfsried collection |
Poland | |
| Siuda et al. (2003) |
Portugal | |
| Pedro Alves collection and analytical ... |
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Point 8.0, Borstein, Reichenbach, Lautertal, Bergstraße, Darmstadt, Hesse, Germany