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Ca2Mn42+Fe23+(PO4)6 · 2H2O
Member of:
Named in 1999 by M. A. Galliski, M. A. Cooper, Frank C. Hawthorne, and Petr Černý in honor of Roberto Beder [February 16, 1888 Zurich, Switzerland - November 19, 1930 Córdoba, Argentina] in recognition of his major contributions to the development of mineralogy in Argentina. assistant at Museum of Natural History of La Plata in 1912 and soon was Professor of Mineralogy at University of Córdoba (1914).

Classification of Bederite


C : Phosphates without additional anions, with H2O
F : With large and medium-sized cations, RO4:H2O > 1:1

Physical Properties of Bederite

Hardness (Mohs):

Optical Data of Bederite

RI values:
nα = 1.729 nβ = 1.738 nγ = 1.741
Measured: 54° , Calculated: 58°
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
r < v strong

Chemical Properties of Bederite

IMA Formula:
Ca2Mn42+Fe23+(PO4)6 · 2H2O Formula:
Ca2(Mn2+)4(Fe3+)2(PO4)6 · 2H2O

Formula simplifies the crystal-chemical features; the Na site in other wicksite-group minerals is vacant in bederite.
Elements listed in formula:

Crystallography of Bederite

Crystal System:

Type Occurrence of Bederite

Relationship of Bederite to other Species

Member of:
Other Members of Group:
GrischuniteNaCa2Mn52+Fe3+(AsO4)6 · 2H2O
Maneckiite(Na◻)Ca2Fe22+(Fe3+Mg)Mn2(PO4)6 · 2H2O
Tassieite(Na,◻)Ca2(Mg,Fe2+,Fe3+)2(Fe2+,Mg)2(Fe3+,Mg)2(PO4)6 · 2H2O
WicksiteNaCa2(Fe2+,Mn2+)4MgFe3+(PO4)6 · 2H2O
8.CF.05GrischuniteNaCa2Mn52+Fe3+(As5+O4)6 · 2H2O
8.CF.05WicksiteNaCa2Fe22+(Fe3+,Mn2+,Fe2+)4(PO4)6 · 2H2O
8.CF.05TassieiteNaCa2Mg3Fe22+Fe3+(PO4)6 · 2H2O
8.CF.10HaigerachiteKFe33+(H2PO4)6(HPO4)2 · 4H2O

Other Names for Bederite

Name in Other Languages:

Other Information

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 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 URL:
Please feel free to link to this page.

Localities for Bederite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
  • Salta
    • La Poma department
      • 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; Galliski, M. A., & Hawthorne, F. C. (2002). Refinement of the crystal structure of ushkovite from Nevados de Palermo, Republica Argentina. The Canadian Mineralogist, 40(3), 929-937.
  • Drâa-Tafilalet 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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