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Bederite

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About BederiteHide

Roberto Beder
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.
Colour:
very dark brown to black
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
3.48
Crystal System:
Orthorhombic
Member of:
Name:
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 BederiteHide

Approved
First Published:
1999
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

Physical Properties of BederiteHide

Vitreous
Colour:
very dark brown to black
Streak:
dark olive-green
Hardness:
Tenacity:
Brittle
Cleavage:
Distinct/Good
Parallel to {100}
Fracture:
Irregular/Uneven
Density:
3.48(1) g/cm3 (Measured)    3.50 g/cm3 (Calculated)

Optical Data of BederiteHide

Type:
Biaxial
RI values:
nα = 1.729(3) nβ = 1.738(3) nγ = 1.741(3)
2V:
Measured: 54° , Calculated: 60°
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r < v strong
Comments:
X = Y = olive green, Z = brown with X = Y > Z and X = a, Y = c, Z = b.

Chemical Properties of BederiteHide

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.
IMA Formula:
Ca2Mn2+4Fe3+2(PO4)6 · 2H2O

Crystallography of BederiteHide

Crystal System:
Orthorhombic

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.768 (100)
2.927 (78)
3.006 (67)
2.814 (35)
2.110 (33)

Occurrences of BederiteHide

Paragenetic Mode(s):

Type Occurrence of BederiteHide

General Appearance of Type Material:
Massive ellipsoidal nodules up to ~5 cm in diameter.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa (CMNMC 81556) and in the Museo Prof. M. Tellechea, CRICYT, Mendoza (no. 8553).
Geological Setting of Type Material:
Rare-element pegmatite of the beryl type, beryl-columbite-phosphate subtype.
Reference:
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.

Synonyms of BederiteHide

Other Language Names for BederiteHide

German:Bederit
Spanish:Bederita

Relationship of Bederite to other SpeciesHide

Member of:
Other Members of this group:
GrischuniteNaCa2Mn2+5Fe3+(AsO4)6 · 2H2OOrth.
Maneckiite(Na◻)Ca2Fe2+2(Fe3+Mg)Mn2(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
Tassieite(Na,◻)Ca2(Mg,Fe2+,Fe3+)2(Fe2+,Mg)2(Fe3+,Mg)2(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
WicksiteNaCa2(Fe2+,Mn2+)4MgFe3+(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m)

Related Minerals - Nickel-Strunz GroupingHide

8.CF.05GrischuniteNaCa2Mn2+5Fe3+(AsO4)6 · 2H2OOrth.
8.CF.05WicksiteNaCa2(Fe2+,Mn2+)4MgFe3+(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m)
8.CF.05Tassieite(Na,◻)Ca2(Mg,Fe2+,Fe3+)2(Fe2+,Mg)2(Fe3+,Mg)2(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CF.10HaigerachiteKFe3+3(HPO4)2(H2PO4)6 · 4H2OMon. 2/m : B2/b

Fluorescence of BederiteHide

Does not fluoresce

Other InformationHide

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 BederiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Roth, P. (2007) Bederite. in Minerals first discovered in Switzerland and minerals named after Swiss individuals, Kristallografik Verlag (Achberg Germany): 164-165.

Internet Links for BederiteHide

Localities for BederiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Argentina
 
  • 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.
Morocco
 
  • 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
Mineral and/or Locality  
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