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Bederite

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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.

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.
Simplified for copy/paste:Ca2(Mn2+)4(Fe3+)2(PO4)6·2H2O
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

Search Engines:
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  • External Links:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Bederite details from Handbook of Mineralogy (PDF)
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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.
    (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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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. 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 thousands 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.
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