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Medenbachite

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About MedenbachiteHide

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:
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.
Copper analogue of neustädtelite and cobaltneustädtelite.


Classification of MedenbachiteHide

Approved
Approval Year:
1993
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

Physical Properties of MedenbachiteHide

Adamantine, Vitreous
Colour:
Yellow to brown-yellow
Hardness:
4½ on Mohs scale

Optical Data of MedenbachiteHide

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.
Surface Relief:
Very High
Dispersion:
r > v

Chemical Properties of MedenbachiteHide

Formula:
Bi2Fe3+Cu2+(AsO4)2O(OH)3

Endmember formula; Cu may be replaced by minor Fe3+.

Crystallography of MedenbachiteHide

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°
Ratio:
a:b:c = 0.742 : 1 : 1.459
Unit Cell V:
247.842 ų
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.82 (60)
5.26 (40)
3.749 (100)
3.596 (80)
3.468 (60)
2.903 (70)
2.685 (50)
2.558 (40)

Type Occurrence of MedenbachiteHide

Synonyms of MedenbachiteHide

Other Language Names for MedenbachiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Mixite1 photo of Medenbachite associated with Mixite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.BK.05BrazilianiteNaAl3(PO4)2(OH)4Mon. 2/m : P2/b
8.BK.10NeustädteliteBi2Fe3+(Fe3+,Co)(AsO4)2(O,OH)4Tric. 1 : P1
8.BK.10CobaltneustädteliteBi2Fe3+(Co,Fe3+)(AsO4)2(O,OH)4Tric. 1 : P1
8.BK.15CuretoniteBa(Al,Ti)(PO4)(OH,O)FMon. 2/m
8.BK.20HeyitePb5Fe2+2(VO4)2O4Mon.
8.BK.25JamesitePb2Zn(Fe2+,Zn)2Fe3+4(AsO4)4(OH)10Tric.
8.BK.25LulzaciteSr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10Tric. 1 : P1

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 MedenbachiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
MAndarino, J.A. (1996) Abstracts of New Mineral Descriptions. Mineralogical Record: 27: 464-465.
Krause, W., Bernhardt, H.J., McCammon, C., Effenberger, H. (2002) Neustädtelite and cobaltneustädtelite, the Fe3+- and Co2+-analogues of medenbachite. American Mineralogist: 87: 726-738.

Internet Links for MedenbachiteHide

Localities for MedenbachiteHide

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
 
  • Baden-Württemberg
    • Black Forest
      • Schenkenzell
Lapis 21(12), 39 (1996)
  • Hesse
    • Odenwald
      • Lautertal (Odenwald)
        • Reichenbach
          • Borstein
W. Krause at al.: Am. Mineral. 81:505-512 (1996)
          • Hohenstein
S Wolfsried collection
Poland
 
  • Lower Silesia
    • Rudawy Janowickie
Siuda, R., Gołębiowska, B. (2003): Nowe dane o minerałach wietrzeniowych złoża Miedzianka-Ciechanowice w Rudawach Janowickich (Dolny Śląsk, Polska). Przegląd Geologiczny: 59(3): 226-252 (in Polish)
Portugal
 
  • Guarda
    • Sabugal
      • Bendada
        • Bendada Mines
Pedro Alves collection and analytical data.
Mineral and/or Locality  
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