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Cordylite-(La)

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Formula:
(Na,Ca)Ba(La,Ce,Sr)
 
2
(CO
 
3
)
 
4
F
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:HexagonalColour:colorless, honey-yellow, ...
Hardness:4
Member of:Cordylite Group
Name:Named as the La-analogue of cordylite-(Ce).
Isostructural with:Cordylite-(Ce)


The Ca and Sr rich La-analogue of cordylite-(Ce).

Classification of Cordylite-(La)

IMA status:Approved 2010
mindat.org URL:http://www.mindat.org/min-41169.html
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Type Occurrence of Cordylite-(La)

Type Locality:Ust'-Biraya, Biraya Fe-REE ore occurrence, Biraya and Bya Rivers confluence area (Chara Basin), Vitim Plateau, Irkutskaya Oblast', Prebaikalia (Pribaikal'e), Eastern-Siberian Region, Russia
Geological Setting of type material:Carbonatite veins in fenites.

Physical Properties of Cordylite-(La)

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

Crystallography of Cordylite-(La)

Crystal System:Hexagonal
Class (H-M):6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:P63/mmc {P63/m 2/m 2/c}
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:
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
Maximum Birefringence:δ = 0.176 - 0.177

Chart 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
(CO
 
3
)
 
4
F


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
Simplified for copy/paste:(Na,Ca)Ba(La,Ce,Sr)2(CO3)4F
Idealised Formula:
NaBaLa
 
2
(CO
 
3
)
 
4
F
Essential elements:Ba, C, F, La, Na, O
All elements listed in formula:Ba, C, Ca, Ce, F, La, Na, O, Sr
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:Cordylite Group
Other Members of Group:

- +
Cordylite-(Ce)
NaBaCe
 
2
(CO
 
3
)
 
4
F
Unnamed (Cordylite-like (Ca0.5[]0.5)BaCe2[CO3]4F)
Ca□Ba
 
2
Ce
 
4
[CO
 
3
]
 
8
F
 
2

Other Names for Cordylite-(La)

Synonyms:
IMA2010-058
Other Languages:

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 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)

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  • Localities for Cordylite-(La)

    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.
    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.
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