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Medenbachite

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Big Photo

Point 14.0, Hohenstein, Reichenbach, Bensheim, Odenwald, Hesse, Germany
© Stephan Wolfsried

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Formula:
Bi
3+
2
Fe
3+
 
(Cu,Fe
3+
 
)(AsO
 
4
)
 
2
(OH,O)
 
4
System:TriclinicColour:Yellow to brown-yellow
Lustre:Adamantine, VitreousHardness:4½
This page provides mineralogical data about Medenbachite.

Classification of Medenbachite

IMA status:Approved 1993
Strunz 8th edition ID:7/B.37-20
Strunz 9th edition ID:8.BK.10
Nickel-Strunz 10th (pending) edition ID: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
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Type Occurrence of Medenbachite

Type Locality:Point 8.0, Borstein, Reichenbach, Bensheim, Odenwald, Hesse, Germany

Physical Properties of Medenbachite

Lustre:Adamantine, Vitreous
Colour:Yellow to brown-yellow
Hardness (Mohs):4½

Crystallography of Medenbachite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 4.57Å, b = 6.162Å, c = 8.993Å
α = 94.56°, β = 99.69°, γ = 94.28°
Ratio:a:b:c = 0.742 : 1 : 1.459
Unit Cell Volume:V 247.842 ų
Z:1
X-Ray Powder Diffraction:
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)

Optical Data of Medenbachite

Type:Biaxial (-)
RI values: nα = 2.030 nβ = 2.090 nγ = 2.100
2V:Measured: 43° , Calculated: 42°
Maximum Birefringence:δ = 0.070

Chart 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 Medenbachite

Formula:
Bi
3+
2
Fe
3+
 
(Cu,Fe
3+
 
)(AsO
 
4
)
 
2
(OH,O)
 
4
Essential elements:As, Bi, Cu, Fe, H, O
All elements listed in formula:As, Bi, Cu, Fe, H, O

Relationship of Medenbachite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BK.05Brazilianite
NaAl
 
3
(PO
 
4
)
 
2
(OH)
 
2
8.BK.10Neustädtelite
Bi
3+
2
Fe
3+
 
(Fe
3+
 
,Co)
 
2
(AsO
 
4
)
 
2
(OH,O)
 
4
8.BK.10Cobaltneustädtelite
Bi
3+
2
Fe
3+
 
(Co,Fe
3+
 
)
 
2
(AsO
 
4
)
 
2
(OH,O)
 
4
8.BK.15Curetonite
Ba
 
4
Al
 
3
Ti(PO
 
4
)
 
4
(O,OH)
 
6
8.BK.20Heyite
Pb
 
5
Fe
2+
2
(VO
 
4
)
 
2
O
 
2
8.BK.25Jamesite
Pb
 
2
Zn(Fe
2+
 
,Zn)
 
2
Fe
3+
4
(AsO
 
4
)
 
4
(OH)
 
10
8.BK.25Lulzacite
Sr
 
2
Fe
2+
 
(Fe
2+
 
,Mg)
 
2
Al
 
4
(PO
 
4
)
 
4
(OH)
 
10

Other Names for Medenbachite

Synonyms:
IMA1993-048
Other Languages:
German:Medenbachit
Russian:Меденбахит
Spanish:Medenbachita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Medenbachite

Reference List:

- +
Mineralogical Record: 27: 464-465.

Krause, W., Bernhardt, H.-J., Gebert, W., Graetsch, H., Belendorff, K. and 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.

Internet Links for Medenbachite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Medenbachite details from Handbook of Mineralogy (PDF)
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    • Localities for Medenbachite

    Hide Locality List
    (TL) indicates type locality. ? 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.
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Schenkenzell
    		Lapis 21(12), 39 (1996)
    • Hesse
      • Odenwald
        • Bensheim
          • Reichenbach
            • Borstein
    		W. Krause at al.: Am. Mineral. 81:505-512 (1996)
            • Hohenstein
    		S Wolfsried collection
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 20th Jun 2011 09:52:45
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