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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
Colour:
colorless, honey-yellow, or pinkish yellow
Lustre:
Vitreous, Greasy
Hardness:
4
Specific Gravity:
4.34
Crystal System:
Hexagonal
Member of:
Name:
Named as the La-analogue of cordylite-(Ce).
Isostructural with:
The Ca and Sr rich La-analogue of cordylite-(Ce).


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Classification of Cordylite-(La)Hide

Approved
Approval Year:
2010

Physical Properties of Cordylite-(La)Hide

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

Optical Data of Cordylite-(La)Hide

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)Hide

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
IMA Formula:
NaCaBa2La3Sr(CO3)8F2
Idealised Formula:
NaBaLa2(CO3)4F

Crystallography of Cordylite-(La)Hide

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 V:
525.84 ų (Calculated from Unit Cell)
Z:
1
Morphology:
irregularly-shaped, tabular, or short-prismatic hexagonal crystals

X-Ray Powder DiffractionHide

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)

Type Occurrence of Cordylite-(La)Hide

Synonyms of Cordylite-(La)Hide

Other Language Names for Cordylite-(La)Hide

Relationship of Cordylite-(La) to other SpeciesHide

Member of:
Other Members of this group:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Strontianite1 photo of Cordylite-(La) associated with Strontianite on mindat.org.
Strontian Calcite1 photo of Cordylite-(La) associated with Strontian Calcite on mindat.org.
Talc1 photo of Cordylite-(La) associated with Talc on mindat.org.

Other InformationHide

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)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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)Hide

Localities for Cordylite-(La)Hide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • 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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