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Seidite-(Ce)

Pictures (2 Images total)

Seidit-(Ce)
Views (File:
1704382931
): 17
Seidit-(Ce)
Blass cremefarben-gelbliche radialstrahlige Seidit-(Ce)-xx (ohne Maßstab) von der Typlokalität im Lovozero Massiv, Murmansk Oblast, Russland. Ex Van den Broucke Sammlung (sh.: https://www.mindat.org/mesg-560223.html).
Copyright: Wikipedia-user: David Hospital; Contribution: oliverOliver
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Lovozero
Mineral: Seidite-(Ce)
Image: 1704382931
License: Creative Commons - Attribution-ShareAlike 4.0 International  (CC BY-SA) V.4.0
Seidit-(Ce)

Blass cremefarben-gelbliche radialstrahlige Seidit-(Ce)-xx (ohne Maßstab) von der Typlokalität im Lovozero Massiv, Murmansk Oblast, Russland. Ex Van den Broucke Sammlung (sh.: https://www.mindat.or~...
Copyright: Wikipedia-user: David Hospital
Contribution: oliverOliver 2024-01-04
Locality: Lovozero / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland
Seidit-(Ce)
Views (File:
1245007637
): 891
Seidit-(Ce)
Aggregatgröße: 5 mm; Fundort: Jubiläumspegmatit, Karnarsurt-Berg, Lovozero-Massiv, Kola-Halbinsel, Russland
Copyright: Pavel M. Kartashov; Contribution: Philip Blümner
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Lovozero/Karnasurt, Berg/Jubiläumspegmatit (Yubileinaya; Yubileinoye; Jubilejnaja)
Mineral: Seidite-(Ce)
Image: 1245007637
Rating: 2 (votes: 1)
License: Usage for Mineralienatlas project only
Seidit-(Ce)

Aggregatgröße: 5 mm; Fundort: Jubiläumspegmatit, Karnarsurt-Berg, Lovozero-Massiv, Kola-Halbinsel, Russland
Copyright: Pavel M. Kartashov
Contribution: Philip Blümner 2009-06-14
Locality: Jubiläumspegmatit (Yubileinaya; Yubileinoye; Jubilejnaja) / Karnasurt, Berg / Lovozero / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color cremeweiß, rosa, hellgelb
Streak color weiß
Hardness (Mohs) 3.00 - 4.00
Cleavages vollkommen {100} und weniger vollkommen {001}
Fracture fasrig and splittrig
Crystal System monoklin, C2/c

Chemism

Chemical formula

Na4Sr(Ce,La)Ti[(F,OH)|Si8O22]·5H2O

Chemical composition

Cerium, Lanthanum, Natrium, Silicium, Strontium, Titan, Fluor, Sauerstoff, Wasserstoff

Unit weight: 1052.5096024875 u; Number of atoms in the formula: 53.25

Info

Empirical formula:

Na4Sr(Ce0.75La0.25)Ti[(F0.75(OH)0.25)Si8O22]·5H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.98

10.25

19.25

1.0079470

10.3314568
Oxygen

O

41.42

27.25

51.17

15.9994300

435.9844675
Fluorine

F

1.35

0.75

1.41

18.9984033

14.2488024
Sodium

Na

8.74

4

7.51

22.9897702

91.9590808
Silicon

Si

21.35

8

15.02

28.0855300

224.6842400
Titanium

Ti

4.55

1

1.88

47.8671000

47.8671000
Strontium

Sr

8.32

1

1.88

87.6210000

87.6210000
Lanthanum

La

3.30

0.25

0.47

138.9055200

34.7263800
Cerium

Ce

9.98

0.75

1.41

140.1161000

105.0870750

Analysis wt%

Ø SiO2 : 45.62, Nb2O5 : 0.78, TiO2 : 6.54, ThO2 : 2.96, La2O3 : 4.62, Ce2O3 : 6.52, Pr2O3 : 0.54, Nd2O3 : 1.60, BaO : 1.56, SrO : 5.20, CaO : 1.04, K2O : 1.20, Na2O : 9.38, F : 1.52, H2O : 10.80, Ln2O3 : 13.44 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 98)

Strunz 9th edition incl. updates

9.DJ.20

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
J:
20:

Lapis Classification

VIII/H.38-055

VIII: SILIKATE
H: Schichtsilikate
38: Schichtsilikate mit Tetraeder-Doppelschichten und verwandte Strukturen

Classification by Hölzel

9.DU.410

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
U: Chains to Phyllosilicates
4: Laplandite-Group

Dana 8th edition

72.05.01.06

72: Phyllosilicates Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
05: Phyllosilicates Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with corrugated and complex layers
01: Rhodesite group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

cremeweiß, rosa, hellgelb

Streak color

weiß

max. Birefringence

0.029
Birefringence chart\! Seidite-(Ce) title=Birefringence chart Seidite-(Ce)

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

1.542

RI value β

1.569

RI value γ / ε

1.571

Ri mean

1.561

2V angle

Biaxial (-) 28°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

24.74

Cell parameters b (Å)

7.186

Cell parameters c (Å)

14.47

Cell parameters a/b or c/a

3.443

Cell parameters c/b

2.014

Cell parameters α

90°

Cell parameters β

95.25

Cell parameters γ

90°

Z

4

Volume (ų)

2561.709

X-Ray Powder Diffraction

12.32(100),
3.57(10),
3.448(10),
3.220(10),
3.104(20),
3.081(20),
3.058(10),
2.705(10)
XRD chart Seidite-(Ce)

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3.00 - 4.00

VHN (Hardness Vickers)

130 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.76 (gemessen)

2.729 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {100} und weniger vollkommen {001}

Fracture

fasrig and splittrig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Lovozero/Karnasurt, Berg/Jubiläumspegmatit (Yubileinaya; Yubileinoye; Jubilejnaja)

Preface

Author (Name, Year)

Khomyakov & Ferraris & Belluso & Britvin & Nechelystov & Soboleva, 199

References

Zapiski Vserossiskogo Mineralogicheskogo Obshchetstva 127 (1998) (4), 94

Other languages

German

Seidit-(Ce)

Spanish

Seidita-(Ce)

English

Seidite-(Ce)

French

Seidite-(Ce)

Russian

Сейдит-(Ce)

CNMNC (IMA)-Number

IMA 1993-029

CNMNC symbol

Symbol

Sei-Ce

IDs

GUSID (Global unique identifier short form) rjKOSMb09kCpPQrCDQv1fA
GUID (Global unique identifier) 488E32AE-F4C6-40F6-A93D-0AC20D0BF57C
Database ID 3464