Dyrnaesite-(La)
Dyrnaesite-(La) is a rare-earth phosphate mineral with the formula Na
8Ce4+
(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 | |
| Category | Phosphate mineral |
| Formula (repeating unit) | Na 8Ce4+ (La,REE) 2(PO 4) 6 |
| Crystal system | Orthorhombic |
| Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
| Space group | Pnma |
| Unit cell | a = 18.466, b = 16.011 c = 7.027 [Å] (approximated) Z = 4 |
| Identification | |
| References | [1][2] |
References
- 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.
- "Dyrnaesite-(La): Dyrnaesite-(La) mineral information and data". Mindat.org. Retrieved 2016-03-04.
- "Cerianite-(Ce): Cerianite-(Ce) mineral information and data". Mindat.org. Retrieved 2016-03-08.
- "Stetindite - Stetindite mineral information and data". Mindat.org. Retrieved 2016-03-08.
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