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Retzian-(Nd)

Collectors Summary

Color rosa braun, rötlichbraun
Streak color hellbraun
Hardness (Mohs) 3.5
Solubility +++ Säuren
Crystal System orthorhombisch, Pban

Chemism

Chemical formula

Mn2(Nd,Ce,La)(AsO4)(OH)4

Chemical composition

Arsen, Cerium, Lanthanum, Mangan, Neodymium, Sauerstoff, Wasserstoff

Unit weight: 459.2961118 u; Number of atoms in the formula: 16

Info

Empirical formula:

Mn2(Nd0.6Ce0.3La0.1)(AsO4)(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.88

4

25.00

1.0079470

4.0317880

Oxygen

O

27.87

8

50.00

15.9994300

127.9954400

Manganese

Mn

23.92

2

12.50

54.9380499

109.8760998

Arsenic

As

16.31

1

6.25

74.9216020

74.9216020

Lanthanum

La

3.02

0.1

0.63

138.9055200

13.8905520

Cerium

Ce

9.15

0.3

1.88

140.1161000

42.0348300

Neodymium

Nd

18.84

0.6

3.75

144.2430000

86.5458000

Analysis wt%

FeO : 0.40, MgO : 2.00, ZnO : 1.80, MnO : 25.90, As2O5 : 26.90, La2O3 : 7.60, Ce2O3 : 7.80, Y2O3 : 1.60, Nd2O3 : 10.90, Pr2O3 : 4.20, Sm2O3 : 2.40, Gd2O3 : 1.90, Eu2O3 : 0.90, H2O : 8.30, Ln2O3 : 37.30 (Ref: American Mineralogist 82)

Strunz 9th edition incl. updates

8.BM.05

8: Phosphate, Arsenate, Vanadate
B: Phosphate, etc., mit weitere Anionen, ohne H2O
M: Mit mittelgroßen und großen [Kationen] (OH, etc.):RO4 = 4:1
05:

Lapis Classification

VII/B.15-040

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
B: Wasserfreie Phosphate, mit fremden Anionen F,Cl,O,OH
15: Mittelgroße Kationen: Mg-Mn-Fe-Cu-Zn

Classification by Hölzel

8.BM.520

8: PHOSPHATES ARSENATES VANADATES
B: Phosphates (+Anions -Water)
M: Phosphates, very large: 2, Vmed: 2,3
5: With REE's Retzian-Group

IMA status

Ohne Prüfung durch die CNMNC veröffentlicht

Optical Properties

Color

rosa braun, rötlichbraun

Streak color

hellbraun

Diaphaneity (Transparency)

teilweise durchscheinend

max. Birefringence

0.024

Birefringence chart\! Retzian-(Nd) title=Birefringence chart Retzian-(Nd)

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

1.774

RI value β

1.782

RI value γ / ε

1.798

Ri mean

1.785

2V angle

Biaxial (+) 69°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

50

Space Group

Pban

Cell parameters a (Å)

5.690

Cell parameters b (Å)

12.12

Cell parameters c (Å)

4.874

Cell parameters a/b or c/a

0.469

Cell parameters c/b

0.402

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volumne (ų)

336.125

X-Ray Powder Diffraction

6.05(20),
4.89(30),
3.534(60),
3.296(10),
2.726(100),
1.857(30),
1.625(20),
1.463(20)

XRD chart Retzian-(Nd)

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

3.5

VHN (Hardness Vickers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.45

4.538 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren

Preface

Author (Name, Year)

Dunn & Sturman, 1982

References

American Mineralogist 67 (1982), 841

Other languages

German

Retzian-(Nd)

English

Retzian-(Nd)

French

Retzian-(Nd)

Spanish

Retziana-(Nd)

Russian

Ретциан-(Nd)

CNMNC symbol

Symbol

Rtz-Nd

Locations with GPS information