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Bederite

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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.

Articles/Blogs about Bederite

Internet Links for Bederite

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  • Raman and XRD data at RRUFF project
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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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