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Fluocerite-(La)

Big Photo

Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany
© Stephan Wolfsried

Show Fluocerite-(La) Photos (2)
Formula:
(La,Ce)F
 
3
System:TrigonalHardness:4 - 5
Name:In allusion to its relationship to Fluocerite-(Ce), plus the "-(La)" suffix due to the dominance of lanthanum in the composition.


The lanthanum analogue of Fluocerite-(Ce).

Classification of Fluocerite-(La)

IMA status:Approved
Strunz 8th edition ID:3/A.10-10
Nickel-Strunz 10th (pending) edition ID:3.AC.15

3 : HALIDES
A : Simple halides, without H2O
C : M:X = 1:3
Dana 8th edition ID:9.3.4.2

9 : NORMAL HALIDES
3 : AX3
Hey's CIM Ref.:8.7.2

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
7 : Halides of the rare earth metals
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Type Occurrence of Fluocerite-(La)

Type Locality:Zhanuzak, Kent Massif, Qaraghandy Oblysy (Karaganda Oblast'), Kazakhstan

Physical Properties of Fluocerite-(La)

Hardness (Mohs):4 - 5

Crystallography of Fluocerite-(La)

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Space Group:P3c1 {P3 2/c 1}
Cell Parameters:a = 7.1871(4) Å, c = 7.3501(5) Å
Ratio:a:c = 1 : 1.023
Unit Cell Volume:V 328.80 ų (Calculated from Unit Cell)
Z:6
Comment:For synthetic material.
X-Ray Powder Diffraction:
d-spacingIntensity
3.60 (4)
3.19 (10)
2.07 (6)
2.01 (6)
1.796 (5.5)
1.736 (4)
1.048 (7)

Optical Data of Fluocerite-(La)

Type:Uniaxial (-)
RI values: nω = 1.609 nε = 1.603
Maximum Birefringence:δ = 0.006

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

Chemical Properties of Fluocerite-(La)

Formula:
(La,Ce)F
 
3
Essential elements:F, La
All elements listed in formula:Ce, F, La

Relationship of Fluocerite-(La) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.AC.05Zharchikhite
AlF(OH)
 
2
3.AC.10Molysite
FeCl
 
3
3.AC.15Fluocerite-(Ce)
(Ce,La)F
 
3
3.AC.20Gananite
BiF
 
3
Related Minerals - Hey's Index Grouping:

- +
8.7.1Fluocerite-(Ce)
(Ce,La)F
 
3
8.7.3Tveitite-(Y)
(Y, Na)
 
6
Ca
 
6
Ca
 
6
F
 
42
8.7.4Gagarinite-(Y)
NaCaY(F,Cl)
 
6

Other Names for Fluocerite-(La)

Other Languages:
Russian:Флюоцерит-(La)

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 Fluocerite-(La)

Reference List:Trudy Mineralogicheskogo Muzeya Akademiya Nauk SSSR (1969): 19: 236.

American Mineralogist (1984): 69: 566.

American Mineralogist (1987): 72: 1031 (Appendix 2).

Zeitschrift für Kristallographie (1994): 209: 239.

Anthony, Bideaux, Bladh & Nichols (1997), Handbook of Mineralogy, Vol. III: 204.

Crystallography Reports (1998): 43: 557.

Acta Crystallographica: B41: 91-93.

Internet Links for Fluocerite-(La)

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

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (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.
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Wolfach
          • Oberwolfach
            • Rankach valley
    		In several collections but sold specimens were never analytically confirmed [U. Kolitsch]
    Kazakhstan
     
    • Qaraghandy Oblysy (Karaganda Oblast')
      • Kent Massif
    		American Mineralogist (1984): 69: 566.; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Mineral and/or Locality
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