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Brenkite

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Schellkopf Mt., Brenk, Niederzissen, Eifel Mts, Rhineland-Palatinate, Germany
© C.H.M.-Schäfer

Show Brenkite Photos (13)
Formula:
Ca
 
2
[F
 
2
|CO
 
3
]
System:Orthorhombic
This page provides mineralogical data about Brenkite.

Classification of Brenkite

IMA status:Approved 1977
Strunz 8th edition ID:5/C.06-10
Nickel-Strunz 10th (pending) edition ID:5.BC.05

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
C : With alkali-earth cations
Dana 8th edition ID:16a.3.6.1

16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)2(XO3)Zq
Hey's CIM Ref.:12.1.6

12 : Carbonates with other anions
1 : Carbonates with halides
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Type Occurrence of Brenkite

Type Locality:Schellkopf Mt., Brenk, Niederzissen, Eifel Mts, Rhineland-Palatinate, Germany
Year of Discovery:1978

Crystallography of Brenkite

Crystal System:Orthorhombic
Cell Parameters:a = 7.65Å, b = 7.55Å, c = 6.54Å
Ratio:a:b:c = 1.013 : 1 : 0.866
Unit Cell Volume:V 377.73 ų (Calculated from Unit Cell)

Optical Data of Brenkite

Type:Biaxial (-)
RI values: nα = 1.525 nβ = 1.590 nγ = 1.593
2V:Measured: 26° to 28°, Calculated: 22°
Maximum Birefringence:δ = 0.068

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v

Chemical Properties of Brenkite

Formula:
Ca
 
2
[F
 
2
|CO
 
3
]
Essential elements:C, Ca, F, O
All elements listed in formula:C, Ca, F, O

Relationship of Brenkite to other Species

Related Minerals - Nickel-Strunz Grouping):
5.BC.10Rouvilleite
Na
 
3
(Ca,Mn,Fe)
 
2
(CO
 
3
)
 
3
F
5.BC.15Podlesnoite
BaCa
 
2
(CO
 
3
)
 
2
F
 
2
Related Minerals - Hey's Index Grouping:
12.1.1Northupite
Na
 
3
Mg(CO
 
3
)
 
2
Cl
12.1.2Barentsite
Na
 
7
AlH
 
2
(CO
 
3
)
 
4
F
 
4
12.1.3Rouvilleite
Na
 
3
(Ca,Mn,Fe)
 
2
(CO
 
3
)
 
3
F
12.1.4Chlormagaluminite
(Mg,Fe
2+
 
)
 
4
Al
 
2
[(OH)
 
12
|(Cl
 
2
,CO
 
3
)] · 2H
 
2
O
12.1.5Defernite
Ca
 
6
(CO
 
3
)
 
2-x
(SiO
 
4
)
 
x
(OH)
 
7
(Cl,OH)
 
1-2x
 (x=0.5)
12.1.7Stenonite
(Sr,Ba,Na)
 
2
AlCO
 
3
F
 
5
12.1.8Bastnäsite-(Ce)
(Ce,La)[F|CO
 
3
]
12.1.9Bastnäsite-(La)
(La,Ce)[F|CO
 
3
]
12.1.10Bastnäsite-(Y)
(Y,Ce)[F|CO
 
3
]
12.1.11Parisite-(Ce)
Ca(Ce,La)
 
2
[F
 
2
|(CO
 
3
)
 
3
]
12.1.12Parisite-(Nd)
Ca(Nd,Ce,La)
 
2
[F
 
2
|(CO
 
3
)
 
3
]
12.1.13Synchysite-(Ce)
Ca(Ce,La)[F|(CO
 
3
)
 
2
]
12.1.14Synchysite-(Y)
Ca(Y,Ce)[F|(CO
 
3
)
 
2
]
12.1.15Synchysite-(Nd)
Ca(Nd,Y,Gd)[F|(CO
 
3
)
 
2
]
12.1.16Röntgenite-(Ce)
Ca
 
2
(Ce,La)
 
3
[F
 
3
|(CO
 
3
)
 
5
]
12.1.17Cordylite-(Ce)
(Na,Ca)BaCe
 
2
(CO
 
3
)
 
4
F
12.1.19Huanghoite-(Ce)
BaCe[F|(CO
 
3
)
 
2
]
12.1.20Zhonghuacerite-(Ce)
Ba
 
2
Ce[F|(CO
 
3
)
 
3
]
12.1.21Cebaite-(Ce)
Ba
 
3
Ce
 
2
[F
 
2
|(CO
 
3
)
 
5
]
12.1.22Thorbastnäsite
Th(Ca,Ce)(CO
 
3
)
 
2
F
 
2
·3H
 
2
O
12.1.23Phosgenite
Pb
 
2
[Cl
 
2
|CO
 
3
]
12.1.24Barstowite
Pb
 
4
[Cl
 
6
|CO
 
3
] · H
 
2
O
12.1.25Albrechtschraufite
Ca
 
4
Mg(UO
 
2
)
 
2
[F
 
2
|(CO
 
3
)
 
6
] · 17 H
 
2
O
12.1.26Kettnerite
(BiO)Ca[F|CO
 
3
]

Other Names for Brenkite

Synonyms:
IMA1977-036
German names:
Brenkit
Russian names:
Бренкит
Spanish names:
Brenkita

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 Brenkite

Reference List:Hentschel, G., Leufer, U., Tillmanns, E. (1978): Brenkit, ein neues Kalzium-Fluor-Carbonat von Schellkopf/Eifel. N.Jb.Mineral., Mh, 1978, 325-329.
American Mineralogist: 64: 241-242.

Tschermaks Mineralogische und Petrographische Mitteilungen: 27: 261-266.

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    Localities for Brenkite

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    Germany
     
    • Rhineland-Palatinate
      • Eifel Mts
        • Niederzissen
          • Brenk
    		Neues Jahrb.Min.,Mh.(1978) 325-329
    USA
     
    • New Mexico
      • Colfax Co.
        • Springer
          • Point of Rocks Mesa (Pecks Mesa)
    		Rocks & Min.: 60:229.
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