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Medenbachite

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

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Formula:
Bi
3+
2
Fe
3+
 
(Cu,Fe
3+
 
)[(OH,O)
 
2
|AsO
 
4
]
 
2
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)

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

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.

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    Localities for Medenbachite

    (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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