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Bederite Mineral Data

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General Bederite Information

Help on Chemical  Formula: Chemical Formula: ([ ],Na)Ca2(Mn++,Mg,Fe++)2(Fe+++,Mg++,Al)2Mn++2(PO4)6•2(H2O)
Help on Composition: Composition: Molecular Weight = 986.80 gm
   Sodium       0.58 %  Na    0.79 % Na2O
   Calcium      8.12 %  Ca   11.37 % CaO
   Magnesium    2.46 %  Mg    4.08 % MgO
   Manganese   16.70 %  Mn   21.57 % MnO
   Aluminum     0.55 %  Al    1.03 % Al2O3
   Iron        10.19 %  Fe    2.18 % FeO / 12.14 % Fe2O3
   Phosphorus  18.83 %  P    43.15 % P2O5
   Hydrogen     0.41 %  H     3.65 % H2O
   Oxygen      42.15 %  O
              ______        ______ 
              100.00 %       99.96 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.25Ca2Mn2+Mg0.7Fe2+0.3Fe3+1.5Mg0.3Al0.2Mn2+2(PO4)6�2(H2O)
Help on Environment: Environment: In a rare-element pegmatite of the beryl type, columbite-phosphate subtype. Isostructural with wicksite and grischunite
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: The El Penon pegmatite in the El Quemado pegmatite field, Nevados de Palermo, Salta Province, Argentina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Roberto Beder (1888-1930) in recognition of his major contributions to the development of mineralogy in Argentina.
Help on Synonym: Synonym: IMA1998-007

Bederite Image

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Comments: Dark brown massive bederite.
Location: El Penon Pegmatite, Nevados de Palermo, Salta, Argentina. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bederite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9785:1:0.9127
Help on Cell Dimensions: Cell Dimensions: a = 12.559, b = 12.834, c = 11.714, Z = 4; V = 1,888.09 Den(Calc)= 3.47
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcab
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.7682(1), 2.927(0.78), 3.006(0.67),2.8142(0.35), 2.11(0.33), 5.853(0.3),

Physical Properties of Bederite

Help on Cleavage: Cleavage: {100} Good
Help on Color: Color: Very dark brown, Black.
Help on Density: Density: 3.48
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Irregular - Very brittle fracture producing irregular fragments
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Nodular - Tuberose forms having irregular protuberances over the surface.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: dark olive green

Optical Properties of Bederite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2121,KPDmeas= 0.2115,KC= 0.2119
Ncalc = 1.74
Help on Optical Data: Optical Data: Biaxial (?), a=1.729, b=1.738, g=1.741, bire=0.0120, 2V(Calc)=58, 2V(Meas)=54. Dispersion r < v strong.

Calculated Properties of Bederite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.38 gm/cc
note: Specific Gravity of Bederite =3.47 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0049352436
Boson Index = 0.9950647564
Help on Photoelectric: Photoelectric: PEBederite = 9.29 barns/electron
U=PEBederite x rElectron Density= 31.42 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bederite is Not Radioactive

Bederite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.02)where A++ (B++)2 (XO4) � x(H2O)
  (40.02.10)Dana Group Wicksite NaCa2(Fe,Mn)4MgFe(PO4)6•2(H2O) P bca 2/m 2/m 2/m Bederite! ([],Na)Ca2(Mn,Mg,Fe)2(Fe,Mg,Al)2Mn2(PO4)6•2(H2O) Pcab 2/m 2/m 2/m Tassieite! (Na,[])Ca2(Mg,Fe,Fe)2(Fe,Mg)2(Fe,Mg)2(PO4)6(H2O)2 P bca 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.CF.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CF -With large and medium-sized cations, RO4:H2O > 1:1
08.CF.05 Grischunite NaCa2Mn5Fe(AsO4)6•2(H2O) Pcab 2/m 2/m 2/m
08.CF.05 Wicksite NaCa2(Fe,Mn)4MgFe(PO4)6•2(H2O) P bca 2/m 2/m 2/m
08.CF.05 Bederite! ([],Na)Ca2(Mn,Mg,Fe)2(Fe,Mg,Al)2Mn2(PO4)6•2(H2O) Pcab 2/m 2/m 2/m
08.CF.05 Tassieite! (Na,[])Ca2(Mg,Fe,Fe)2(Fe,Mg)2(Fe,Mg)2(PO4)6(H2O)2 P bca 2/m 2/m 2/m

Other Bederite Information

Help on References: References: NAME( MinRec,Vol 31, No 4) PHYS. PROP.(MinRec,Vol 31, No 4) OPTIC PROP.(MinRec,Vol 31, No 4)
Help on See Also: See Also: Links to other databases for Bederite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Print or Cut-and-Paste your Bederite Specimen Label here :


([ ],Na)Ca2(Mn++,Mg,Fe++)2(Fe+++,Mg++,Al)2Mn++2(PO4)6•2(H2O)
Dana No: Strunz No: 08.CF.05





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