Dyrnaesite-(La)

Dyrnaesite-(La)
General
Category Phosphate mineral
Formula
(repeating unit)		 Na8Ce4+(La,REE)2(PO4)6
Crystal system Orthorhombic, Pnma
Unit cell a=18.466, b=16.011, c=7.027 (approximated)
Identification
Crystal symmetry Orthorhombic - Dipyramidal (mmm)
References [1][2]

Dyrnaesite-(La) is a recently described rare earth phosphate mineral with the formula Na8Ce4+(La,REE)2(PO4)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]

References

  1. 1 2 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. 1 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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