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Cordylite-(La)

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Formula:
(Na,Ca)Ba(La,Ce,Sr)2(CO3)4F
Formula with Z=1 more clear show composition peculiarities of the mineral with developed heterovalent isomorphism Na + REE = Ca + Sr.
(NaCa)Ba2((La,Ce)3Sr)(CO3)8F2
System:
Hexagonal
Colour:
colorless, honey-yellow, ...
Hardness:
4
Member of:
Name:
Named as the La-analogue of cordylite-(Ce).
Isostructural with:
The Ca and Sr rich La-analogue of cordylite-(Ce).

Classification of Cordylite-(La)

Approved 2010
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First Recorded Occurrence of Cordylite-(La)

Geological Setting of First Recorded Material:
Carbonatite veins in fenites.

Physical Properties of Cordylite-(La)

Vitreous, Greasy
Colour:
colorless, honey-yellow, or pinkish yellow
Hardness (Mohs):
4
Tenacity:
Brittle
Cleavage:
Perfect
on {0001}
Fracture:
Irregular/Uneven, Conchoidal
Density:
4.34 g/cm3 (Measured)    4.329 g/cm3 (Calculated)

Crystallography of Cordylite-(La)

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Cell Parameters:
a = 5.1182(5) Å, c = 23.1785(16) Å
Ratio:
a:c = 1 : 4.529
Unit Cell Volume:
V 525.84 ų (Calculated from Unit Cell)
Z:
1
Morphology:
irregularly-shaped, tabular, or short-prismatic hexagonal crystals
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.371 (65)
4.148 (54)
3.532 (100)
3.209 (95)
2.562 (89)
2.213 (52)
2.051 (44)
1.921 (52)

Optical Data of Cordylite-(La)

Type:
Uniaxial (-)
RI values:
nω = 1.749 - 1.751 nε = 1.573 - 1.574
Max Birefringence:
δ = 0.176 - 0.177
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Cordylite-(La)

Formula:
(Na,Ca)Ba(La,Ce,Sr)2(CO3)4F

Formula with Z=1 more clear show composition peculiarities of the mineral with developed heterovalent isomorphism Na + REE = Ca + Sr.
(NaCa)Ba2((La,Ce)3Sr)(CO3)8F2
Idealised Formula:
NaBaLa2(CO3)4F
Essential elements:
All elements listed in formula:
Analytical Data:
microprobe data
La2O3  18.31  17.01
Ce2O3  15.67  15.93
Pr2O3   0.48   1.21
Nd2O3   2.10   3.09
CaO     3.17   3.22
SrO     6.70   7.16
BaO    23.43  22.21
Na2O   2.80   2.78
F        2.47   2.10
Sum   75.13  74.71
CO2calc  25.87  25.89
H2Ocalc   0.03   0.25
Sum 101.03 100.85
-F=O  1.04   0.88
Sum  99.99  99.97
Empirical Formula:
(Na1.24Ca0.78)Ba2.10(La1.54Ce1.31Sr0.89Nd0.17Pr0.04)[CO3]8(F1.78OH0.05) and (Na1.23Ca0.79)Ba1.98

Relationship of Cordylite-(La) to other Species

Member of:
Other Members of Group:

Other Names for Cordylite-(La)

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Cordylite-(La)

Reference List:
Mills, S. J., Kartashov, P. M., Kampf, A. R., Konev, A. A., Koneva, A. A., & Raudsepp, M. (2012). Cordylite-(La), A New Mineral Species In Fenite From The Biraya Fe–Ree Deposit, Irkutsk, Russia. The Canadian Mineralogist, 50(5), 1281-1290.

Internet Links for Cordylite-(La)

Localities for Cordylite-(La)

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Russia
 
  • Eastern-Siberian Region
    • Prebaikalia (Pribaikal'e)
      • Irkutskaya Oblast'
        • Vitim Plateau
          • Biraya and Bya Rivers confluence area (Chara Basin)
            • Biraya Fe-REE ore occurrence
Mills, S. J., Kartashov, P. M., Kampf, A. R., Konev, A. A., Koneva, A. A., & Raudsepp, M. (2012). Cordylite-(La), A New Mineral Species In Fenite From The Biraya Fe–Ree Deposit, Irkutsk, Russia. The Canadian Mineralogist, 50(5), 1281-1290.
Mineral and/or Locality  
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