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Bederite

Big Photo

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

Formula:
NaCa
 
2
(Mn
2+
 
,Mg,Fe
2+
 
)
 
2
Mn
2+
2
(Fe
3+
 
,Mg
2+
 
,Al)
 
2
[PO
 
4
]
 
6
 · 2H
 
2
O
System:OrthorhombicLustre:Vitreous
Hardness:5
Name:For Roberto Beder (1888-1930) in recognition of his major contributions to the development of mineralogy in Argentina.
This page provides mineralogical data about Bederite.

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:
NaCa
 
2
(Mn
2+
 
,Mg,Fe
2+
 
)
 
2
Mn
2+
2
(Fe
3+
 
,Mg
2+
 
,Al)
 
2
[PO
 
4
]
 
6
 · 2H
 
2
O
Essential elements:Ca, Fe, H, Mn, O, P
All elements listed in formula:Al, Ca, Fe, H, Mg, Mn, Na, O, P

Relationship of Bederite to other Species

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
[(H
 
2
PO
 
4
)
 
3
|HPO
 
4
]
 
2
 · 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:American Mineralogist: 84: 1674-1679.

Internet Links for Bederite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Bederite in the Natural History Museum (London) online catalogue
  • Bederite details from Handbook of Mineralogy (PDF)
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    Localities for Bederite

    (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
        • El Quemado District
    		Amer.Min.(1999) 84, 1674-1679
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the 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 hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 23rd Oct 2009 11:16:32