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Dyrnaesite-(La)

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Formula:
Na8Ce4+(La,REE)2(PO4)6
Colour:
Pale yellowish-green
Lustre:
Vitreous
Specific Gravity:
3.68
Crystal System:
Orthorhombic
Name:
The name is after the base camp area, Dyrnæs (animal headland), north of the town of Narsaq, Kujalleq Kommune, South Greenland. The camp was used during the geological mapping of the Ilímaussaq alkaline complex in the period 1957-1983.
Structurally related to vitusite-(Ce). Third mineral with tetravalent cerium after cerianite-(Ce) and stetindite. Unique combination of elements; a quite specific feature is also division of REEs into separate structural positions (compare laptevite-(Ce)). Commonly altered to a REE phosphate and monazite.


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Classification of Dyrnaesite-(La)Hide

Approved
Approval Year:
2014

Physical Properties of Dyrnaesite-(La)Hide

Vitreous
Transparency:
Transparent
Colour:
Pale yellowish-green
Streak:
white
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
3.68(2) g/cm3 (Measured)    3.682 g/cm3 (Calculated)

Optical Data of Dyrnaesite-(La)Hide

Type:
Biaxial (-)
RI values:
nα = 1.623(5) nβ = 1.685(10) nγ = 1.698(2)
2V:
Measured: 47° (1), Calculated: 48°
Max Birefringence:
δ = 0.076
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Weak
Comments:
pale yellowish green with the stongest color parallel to α

Chemical Properties of Dyrnaesite-(La)Hide

Formula:
Na8Ce4+(La,REE)2(PO4)6
Common Impurities:
Ce(III),Nd,Pr,(Ca)

Crystallography of Dyrnaesite-(La)Hide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 18.4662(7) Å, b = 16.0106(5) Å, c = 7.0274(2) Å
Ratio:
a:b:c = 1.153 : 1 : 0.439
Unit Cell V:
2077.7 ų
Z:
4
Twinning:
{210} and {230}

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.57(100)
4.62(40)
4.14(28)
3.86(38)
3.50(40)
2.80(86)
2.67(54)
1.930(34)
Comments:
From Type Description.

Occurrences of Dyrnaesite-(La)Hide

Paragenetic Mode(s):

Type Occurrence of Dyrnaesite-(La)Hide

General Appearance of Type Material:
Dyrnaesite-(La) occurs as 0.2 - 0.7 mm subhedral grains
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Natural History Museum, University of Copenhagen, Copenhagen, Denmark, specimen number 2014.1
Geological Setting of Type Material:
Arfvedsonite lujavrite forming a sheet
Associated Minerals at Type Locality:

Synonyms of Dyrnaesite-(La)Hide

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 Dyrnaesite-(La)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Rønsbo, J.G., Balić-Žunić, T., Petersen, O.V. (2017): Dyrnaesite-(La) a new hyperagpaitic mineral from the Ilímaussaq alkaline complex, South Greenland. Mineralogical Magazine: 81: 103–111.
Balić-Žunić, T. (2017): The crystal structure of the new mineral dyrnaesite-(La), Na8CeIVREE2(PO4)6. Mineralogical Magazine 81, 199-208.)

Internet Links for Dyrnaesite-(La)Hide

Localities for Dyrnaesite-(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.
Denmark (TL)
 
  • Greenland
    • Kujalleq
      • Narsaq
        • Ilímaussaq complex
          • Taseq area
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.; Rønsbo, J.G., Balić-Žunić, T., Petersen, O.V. (20167): Dyrnaesite-(La) a new hyperagpaitic mineral from the Ilímaussaq alkaline complex, South Greenland. Mineralogical Magazine: 81:, 103–111
Mineral and/or Locality  
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