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Dyrnaesite-(La) (Dyrnaesit-(La))

Additional Functions

Collectors Summary

Color blass gelblich grün
Cleavages keine
Fracture unregelmäßig
Crystal System orthorhombisch, Pnma

Chemism

Chemical formula

Na8Ce4+(La,REE)2(PO4)6

Empirical formula (analysis)

Na7.89(Ce0.94Ca0.06)Σ1.00(Ca0.12La1.14Ce0.40Pr0.10Nd0.24)Σ2.00(PO4)6

Chemical composition

Cerium, Lanthanum, Natrium, Phosphor, Sauerstoff, REE

Unit weight: 1153.249238078 u; Number of atoms in the formula: 40.89

Info

Empirical formula:

Na7.89(Ce0.94Ca0.06)(Ca0.12La1.14Ce0.40Pr0.10Nd0.24)(PO4)6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

33.30

24

58.69

15.9994300

383.9863200

Sodium

Na

15.73

7.89

19.30

22.9897702

181.3892869

Phosphorus

P

16.11

6

14.67

30.9737612

185.8425672

Calcium

Ca

0.63

0.18

0.44

40.0784000

7.2141120

Lanthanum

La

13.73

1.14

2.79

138.9055200

158.3522928

Cerium

Ce

16.28

1.34

3.28

140.1161000

187.7555740

Praseodymium

Pr

1.22

0.1

0.24

140.9076520

14.0907652

Neodymium

Nd

3.00

0.24

0.59

144.2430000

34.6183200

IMA status

von der CNMNC anerkanntes Mineral; CNMNC Newsletter No. 23, Februar 2015

Mineral status

anerkanntes Mineral

Optical Properties

Color

blass gelblich grün

max. Birefringence

0.0756

Birefringence chart\! Dyrnaesite-(La) title=Birefringence chart Dyrnaesite-(La)

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

α = 1.6226(5)

RI value β

β = 1.6852(10)

RI value γ / ε

γ = 1.6982(2)

Ri mean

1.7633

2V angle

Biaxial(-) 47(1)° (gemessen) 48° (berechnet)

Orientation

X = c, Y = a, Z = b

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnma

Cell parameters a (Å)

18.4662(7)

Cell parameters b (Å)

16.0106(5)

Cell parameters c (Å)

7.0274(2)

Cell parameters a/b or c/a

1.153

Cell parameters c/b

0.439

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

2077.686

Kristall structure

Struktur bestimmt, ähnelt der von Vitusit-(Ce); siehe Jørn G. Rønsbo, Tonči Balić-Žunić, Ole V. Petersen: Dyrnaesite-(La) a new hyperagpaitic mineral from the Ilímaussaq alkaline complex, South Greenland. Mineralogical Magazine Jhrg. 81, Nr. 1 (2017) S. 103-111.
Tonči Balić-Žunić: The crystal structure of the new mineral dyrnaesite-(La), Na8CeIVREE2(PO4)6. Mineralogical Magazine Jhrg. 81, Nr. 1 (2017) S. 199-208.

X-Ray Powder Diffraction

6.57(100), 4.62(40), 4.14(28), 3.86(38), 3.50(40), 2.80(86), 2.67(54), 1.930(34)

XRD chart Dyrnaesite-(La)

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Physical Properties

Density (g/cm³)

3.68(2) (gemessen) 3.682 (berechnet)

3.687 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

unregelmäßig

(Co-)Type locality

(Co-)Type locality

Grönland/Kommune Kujalleq/Narsaq/Ilimaussaq-Komplex/Tasseq/Tasseq-Hänge (Taseq-Hänge)

Type material

Natural History Museum, University of Copenhagen, Copenhagen, Dänemark

Collection number of type material

2014.1

Preface

Author (Name, Year)

Jørn G. Rønsbo, Tonči Balić-Žunić und Ole V. Petersen, 2017

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.

Jørn G. Rønsbo, Tonči Balić-Žunić, Ole V. Petersen: Dyrnaesite-(La) a new hyperagpaitic mineral from the Ilímaussaq alkaline complex, South Greenland. Mineralogical Magazine Jhrg. 81, Nr. 1 (2017) S. 103-111.

Other languages

German

Dyrnaesit-(La)

English

Dyrnaesite-(La)

Russian

Дирнаесит-(La)

IMA Number

IMA 2014-070

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Dyrnaesit-(La)
Google-Bilder-Suche - search for: Dyrnaesit-(La)
Mineralogisch-Petrographisches-Institut Hamburg - search for: Dyrnaesit-(La)

English pages

Mindat - search for: Dyrnaesite-(La)
Webmineral - search for:Dyrnaesite-(La)
Handbook-of-Mineralogy - search for: Dyrnaesite-(La)
RRUFF - Raman, XRD and other mineral data - search for: Dyrnaesite-(La)
RRUFF - References and PDF downloads - search for: Dyrnaesite-(La)
American-Mineralogist-Crystal-Structure-Database - search for: Dyrnaesite-(La)
Athena - search for: Dyrnaesite-(La)

Russian pages

Webmineral.ru - search for: Дирнаесит-(La)

Mineral Dealer

German pages

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Crystal-Treasure.com - search for: Dyrnaesit-(La)
Bosse - search for: Dyrnaesit-(La)



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