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Mendeleevite-(Nd) (Mendeleevit-(Nd))

Collectors Summary

Color farblos
Hardness (Mohs) 5 - 5.5
Crystal System kubisch, Pm3

Chemism

Chemical formula

Cs6[(Nd,REE)23Ca7](Si70O175)(OH,F)19(H2O)16

Empirical formula (analysis)

Cs6(☐4.20K1.80)Σ6{[(Nd9.57Ce6.13Sm2.39La2.20Pr1.68Gd0.93Eu0.27)Σ23.17 (Ca3.90Sr2.87)Σ6.77]Σ29.940.06}Σ30 (Si70.03O175)(OH14.47F6.54)Σ21.01 (H2O)14

Chemical composition

Cäsium, Calcium, Neodymium, Silicium, Fluor, Sauerstoff, Wasserstoff, REE

Unit weight: 9777.6435016476 u; Number of atoms in the formula: 351.04

Info

Empirical formula:

Cs6(Vc4.20K1.80){[(Nd9.57Ce6.13Sm2.39La2.20Pr1.68Gd0.93Eu0.27)(Ca3.90Sr2.87)]Vc0.06}(Si70.03O175)(OH14.47F6.54)(H2O)14

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Vacancy

Vc

0.00

4.26

1.21

0.0000000

0.0000000

Hydrogen

H

0.44

42.47

12.10

1.0079470

42.8075091

Oxygen

O

31.09

190

54.12

15.9994300

3,039.8917000

Fluorine

F

1.27

6.54

1.86

18.9984033

124.2495573

Silicon

Si

20.12

70.03

19.95

28.0855300

1,966.8296659

Potassium

K

0.72

1.8

0.51

39.0983100

70.3769580

Calcium

Ca

1.60

3.9

1.11

40.0784000

156.3057600

Strontium

Sr

2.57

2.87

0.82

87.6210000

251.4722700

Caesium

Cs

8.16

6

1.71

132.9054520

797.4327120

Lanthanum

La

3.13

2.2

0.63

138.9055200

305.5921440

Cerium

Ce

8.78

6.13

1.75

140.1161000

858.9116930

Praseodymium

Pr

2.42

1.68

0.48

140.9076520

236.7248554

Neodymium

Nd

14.12

9.57

2.73

144.2430000

1,380.4055100

Samarium

Sm

3.68

2.39

0.68

150.3630000

359.3675700

Europium

Eu

0.42

0.27

0.08

151.9641000

41.0303070

Gadolinium

Gd

1.50

0.93

0.26

157.2530000

146.2452900

Strunz 9th edition incl. updates

9

9: Silikate (Germanate)
9:
9:

IMA status

anerkannt - CNMNC Newsletter No. 26, August 2015, page 945

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Crystallography

Crystal System

kubisch

Class (H-M)

m3

Space Group number

200

Space Group

Pm3

Cell parameters a (Å)

21.9106(4)

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

1

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volume (ų)

10518.718

Crystal structure

Das Nd-Analog von Mendeleevit-(Ce)

X-Ray Powder Diffraction

15.63(55), 12.73(40), 11.01(100), 4.07(30), 3.47(42), 3.099(42), 2.192(42), 1.819(41)

XRD chart Mendeleevite-(Nd)

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

Physical Properties

Hardness (Mohs)

5 - 5.5

Density (g/cm³)

3.20(2)(gemessen) 3.155 (berechnet)

3.087 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Tadschikistan/Republik-unterstellte Gebiete (Nohijahoi tobei Dschumhurij)/Dara-i-Pioz (Darai-Pioz)

Type material

A.E. Fersman Mineralogical Museum, Moskau, Russland

Collection number of type material

4707/1

Preface

Name from

Der Name ehrt Dmitri Mendelejew (1834-1907), russischer Chemiker, Autor des Periodensystems der chemischen Elemente, das einen wesentlichen Einfluss auf die Entwicklung der Naturwissenschaften und der Industrie, sowohl in Russland hatte und auf der ganzen Welt hat.

Author (Name, Year)

Atali A. Agakhanov, Leonid A. Pautov, Elena Sokolova, Frank C. Hawthorne, Vladimir Y. Karpenko, Oleg. I. Siidra and Viktor K. Garanin (2015)

References

Agakhanov, A.A., Pautov, L.A., Sokolova, E., Hawthorne, F.C., Karpenko, V.Y., Siidra, O.I. and Garanin, V.K. (2015) Mendeleevite-(Nd), IMA 2015-031. CNMNC Newsletter No. 26, August 2015, page 945;Mineralogical Magazine, 79, 941 - 947.

Agakhanov, A.A., Pautov, L.A., Sokolova, E., Hawthorne, F.C., Karpenko, V.Yu., Siidra, O.I., Garanin, V.K. - Mendeleevite-(Nd), (Cs,□)6(□,Cs)6(□,K)6(REE,Ca)30(Si70O175)(OH,H2O,F)35, a new mineral from the Darai-Pioz alkaline massif, Tajikistan. Mineralogical Magazine, 81 (2017), 135–141.

Other languages

German

Mendeleevit-(Nd)

English

Mendeleevite-(Nd)

CNMNC (IMA)-Number

IMA 2015-031

CNMNC symbol

Symbol

Mdl-Nd

Locations with GPS information

IDs

GUSID (Global unique identifier short form) AceI8warP0627y4nA042rQ
GUID (Global unique identifier) F388C701-AB06-4E3F-B6EF-2E27034E36AD
Database ID 7983