Dyrnaesite-(La)

Dyrnaesite-(La) is a rare-earth phosphate mineral with the formula Na
8
Ce4+
(La,REE)
2
(PO
4
)
6
. Dyrnaesite-(La) is related to vitusite-(Ce), another rare-earth phosphate mineral.[1][2] It comes from lujavrite, a type of alkaline syenite rock, of South Greenland. Dyrnaesite-(La) is one of few known minerals with essential tetravalent cerium, the other two being cerianite-(Ce) and stetindite.[3][4]

Dyrnaesite-(La)
General
CategoryPhosphate mineral
Formula
(repeating unit)
Na
8
Ce4+
(La,REE)
2
(PO
4
)
6
Crystal systemOrthorhombic
Crystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space groupPnma
Unit cella = 18.466, b = 16.011
c = 7.027 [Å] (approximated)
Z = 4
Identification
References[1][2]

References

  1. Rønsbo, J. G., Balić-Žunić, T., and Petersen, O. V., 2015. Dyrnaesite-(La), IMA 2014-070. CNMNC Newsletter No. 23, February 2015, page 54; Mineralogical Magazine, 79, 51–58.
  2. "Dyrnaesite-(La): Dyrnaesite-(La) mineral information and data". Mindat.org. Retrieved 2016-03-04.
  3. "Cerianite-(Ce): Cerianite-(Ce) mineral information and data". Mindat.org. Retrieved 2016-03-08.
  4. "Stetindite - Stetindite mineral information and data". Mindat.org. Retrieved 2016-03-08.
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