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Bederite

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Big Photo

El Peñón pegmatite, El Quemado District, Nevados de Palermo, Salta, Argentina
© 2008, JGW




Formula:
Ca
 
2
(Mn
2+
 
)
 
4
(Fe
3+
 
)
 
2
(PO
 
4
)
 
6
 · 2H
 
2
O
Formula simplifies the crystal-chemical features; the Na site in other wicksite-group minerals is vacant in bederite.
System:OrthorhombicLustre:Vitreous
Hardness:5
Name:For Roberto Beder (1888-1930), Swiss-Argentinian mineralogist, in recognition of his major contributions to the development of mineralogy in Argentina.


Wicksite Group.

Classification of Bederite

IMA status:Approved
Strunz 8th edition ID:7/C.18-15
Nickel-Strunz 10th (pending) edition ID:8.CF.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
F : With large and medium-sized cations, RO4:H2O > 1:1
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Type Occurrence of Bederite

Type Locality:El Peñón pegmatite, El Quemado District, Nevados de Palermo, Salta, Argentina

Physical Properties of Bederite

Lustre:Vitreous
Hardness (Mohs):5

Crystallography of Bederite

Crystal System:Orthorhombic

Optical Data of Bederite

Type:Biaxial
RI values: nα = 1.729 nβ = 1.738 nγ = 1.741
2V:Measured: 54° , Calculated: 58°
Maximum Birefringence:δ = 0.012

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r < v strong

Chemical Properties of Bederite

Formula:
Ca
 
2
(Mn
2+
 
)
 
4
(Fe
3+
 
)
 
2
(PO
 
4
)
 
6
 · 2H
 
2
O


Formula simplifies the crystal-chemical features; the Na site in other wicksite-group minerals is vacant in bederite.
Essential elements:Ca, Fe, H, Mn, O, P
All elements listed in formula:Ca, Fe, H, Mn, O, P

Relationship of Bederite to other Species

Structurally related to group(s):
Wicksite Group
Related Minerals - Nickel-Strunz Grouping):

- +
8.CF.05Grischunite
NaCa
 
2
Mn
2+
5
Fe
3+
 
(AsO
 
4
)
 
6
 · 2H
 
2
O
8.CF.05Wicksite
NaCa
 
2
(Fe
2+
 
,Mn
2+
 
)
 
4
MgFe
3+
 
(PO
 
4
)
 
6
 · 2H
 
2
O
8.CF.05Tassieite
(Na,◻)Ca
 
2
(Mg,Fe
2+
 
,Fe
3+
 
)
 
2
(Fe
2+
 
,Mg)
 
2
(Fe
3+
 
,Mg)
 
2
(PO
 
4
)
 
6
 · 2H
 
2
O
8.CF.10Haigerachite
KFe
3+
3
(HPO
 
4
)
 
2
(H
 
2
PO
 
4
)
 
6
 · 4H
 
2
O

Other Names for Bederite

Synonyms:
IMA1998-007
Other Languages:
German:Bederit
Russian:Бедерит
Spanish:Bederita

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 Bederite

Reference List:

- +
Galliski M A, Cooper M A, Hawthorne F C, Černý P (1999): Bederite, a new pegmatite mineral from Nevados de Palermo, Argentina: description and crystal structure. American Mineralogist 84, 1674-1679.

Internet Links for Bederite

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    • Localities for Bederite

    The 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.
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    (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.
    Argentina
     
    • Salta
      • Nevados de Palermo
    		M. A. Galliski (1981). Estructura, mineralogía y génesis de las pegmatitas de El Quemado, Salta, República Argentina. Tesis doctoral, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba.
    Amer.Min.(1999) 84, 1674-1679
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
    		Kampf, A.R., Mills, S.J., Housley, R.M., Favreau, G., Boulliard, J-C, and Bourgoin, V. (2012) Angarfite, a new mineral species from the Angarf-sud pegmatite, Morocco : description and crystal structure. The Canadian Mineralogist Vol. 50, pages 781-791. DOI 10.3749/canmin.50.4.781
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