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Polyakovite-(Ce)

Pictures (3 Images total)

Polyakovit-(Ce)
Views (Image: 1244958243): 1345
Polyakovit-(Ce)

muscheliger Bruch; Größe: 45x30x25 mm; Fundort: Grube Nr. 97, Naturschutzgebiet Ilmen, Ilmen-Gebirge, Tscheljabinsk, Ural, Russland

Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-06-14
Locality: Grube Nr. 97 / Naturschutzgebiet Ilmen / Ilmen-Gebirge / Tscheljabinsk, Oblast / Ural, Föderationskreis / Russland
Polyakovit-(Ce)
Views (Image: 1244958272): 780
Polyakovit-(Ce)

Größe: 1x3 mm; Fundort: Grube Nr. 97, Naturschutzgebiet Ilmen, Ilmen-Gebirge, Tscheljabinsk, Ural, Russland

Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-06-14
Locality: Grube Nr. 97 / Naturschutzgebiet Ilmen / Ilmen-Gebirge / Tscheljabinsk, Oblast / Ural, Föderationskreis / Russland
Polyakovit-(Ce)
Views (Image: 1244958194): 819
Polyakovit-(Ce)

bisher größter, bekannter Kristall; Größe: 45x30x25 mm; Fundort: Grube Nr. 97, Naturschutzgebiet Ilmen, Ilmen-Gebirge, Tscheljabinsk, Ural, Russland

Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-06-14
Locality: Grube Nr. 97 / Naturschutzgebiet Ilmen / Ilmen-Gebirge / Tscheljabinsk, Oblast / Ural, Föderationskreis / Russland

Collectors Summary

Color schwarz
Streak color braun
Hardness (Mohs) 5.50 - 6.00
Cleavages keine
Fracture muschelig

Chemism

Chem­ical formula

(Ce,La,Nd,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2[O4|Si2O7]2

Chem­ical com­po­si­tion

Calcium, Cerium, Chrom, Eisen, Lanthanum, Magnesium, Neodymium, Niob, Silicium, Titan, Sauerstoff

Unit weight: 1261.34528 u; Number of atoms in the formula: 35

Info

Empirical formula:

(Ce0.55La0.3Nd0.1Ca0.05)4(Mg0.75Fe0.25)(Cr0.75Fe0.25)2(Ti0.75Nb0.25)2[O4Si2O7]2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

27.91

22

62.86

15.9994300

351.9874600

Magnesium

Mg

1.45

0.75

2.14

24.3050600

18.2287950

Silicon

Si

8.91

4

11.43

28.0855300

112.3421200

Calcium

Ca

0.64

0.2

0.57

40.0784000

8.0156800

Titanium

Ti

5.69

1.5

4.29

47.8671000

71.8006500

Chromium

Cr

6.18

1.5

4.29

51.9961600

77.9942400

Iron

Fe

3.32

0.75

2.14

55.8452000

41.8839000

Niobium

Nb

3.68

0.5

1.43

92.9063820

46.4531910

Lanthanum

La

13.21

1.2

3.43

138.9055200

166.6866240

Cerium

Ce

24.44

2.2

6.29

140.1161000

308.2554200

Neodymium

Nd

4.57

0.4

1.14

144.2430000

57.6972000

Anal­y­sis wt%

Ø SiO2 : 19.08, Nb2O5 : 3.98, TiO2 : 9.49, Cr2O3 : 7.42, Fe2O3 : 4.30, FeO : 1.09, MgO : 2.50, ThO2 : 2.79, Ce2O3 : 24.24, La2O3 : 15.94, Nd2O3 : 4.76, Pr2O3 : 2.01, CaO : 1.06, Ln2O3 : 47.71 (Ref: Canadian Mineralogist 2001)

Strunz 9th edi­tion incl. updates

9.BE.70

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
E: Si2O7 Gruppen mit zusätzlichen Anionen; Kationen in oktahedraler [6] und größerer Koordination
70:Chevkinit-Gruppe

Lapis Clas­sifica­tion

VIII/C.17-020

VIII: SILIKATE
C: Gruppensilikate
17: Gruppensilikate [Si2O7] 6-, mit tetraederfremden Anionen (O,OH,F); Chevkinit-Reihe

Clas­sifica­tion by Hölzel

9.BK.150

9: SILICATES
B: Sorosilicates
K: Perrierite-Group

Dana 8th edi­tion

56.02.08.07

56: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O
02: Sorosilicates Sorosilicate Si2O7 Groups and O, OH, F. and H2O with cations in [4] and/or >[4] coordination
08: Perierite - Chevkinite group

IMA Classification

IMA Clas­sifica­tion

Chevkinite group  ⇒ Chevkinite subgroup

Optical Properties

Color

schwarz

Streak color

braun

RI value α / ω / n

1.933

RI value β

metam.

Ri mean

1.933

Crystallography

Cell param­e­ters a (Å)

13.398

Cell param­e­ters b (Å)

5.697

Cell param­e­ters c (Å)

11.042

Cell param­e­ters a/b or c/a

2.352

Cell param­e­ters c/b

1.938

Cell param­e­ters α

90°

Cell param­e­ters β

100.53

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

828.7

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

5.50 - 6.00

VHN (Hard­ness Vick­ers)

874 (200g)

Density (g/cm³)

4.75 (gemessen)

5.055 ( ρ calc. Mineralienatlas )

Cleav­ages

keine

Frac­ture

muschelig

Tenac­ity

spröde

References

R. Macdonald, B. Bagiński, P. M. Kartashov, D. Zozulya and P. Dzierżanowski - Chevkinite-group minerals from Russia and Mongolia: new compositional data from metasomatites and ore deposits - Mineralogical Magazine, June 2012, Vol. 76(3), pp. 535–549 http://rruff.info/uploads/MM76_535.pdf

IMA group assignments



 
 
 
(Ce,La,Ca,Na,Th)4(Fe2+,Mg)2(Ti,Fe3+)3Si4O22
monoklin
C2/m

 
 
 
 
 
 

 
 
 
Ce4Mg(Fe3+,W)3☐(Si2O7)2O6(OH)2
monoklin
C2/m

 
 
 
(Ce,La)4Fe2+(Ti,Fe2+,Mg,Fe3+)2Ti2Si4O22
monoklin
P21/a

 
 
 
(REE,Ca)4(Fe3+,Ti,Fe2+,☐)(Ti,Fe3+,Fe2+,Nb)4Si 4O22
monoklin
C2/m

 
 
 
(Ce,La,Nd,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2[O4|Si2O7]2
 
 

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Actuality: 17. May 2022 - 15:28:32

Other languages

German

Polyakovit-(Ce)

Spanish

Polyakovita-(Ce)

English

Polyakovite-(Ce)

Russian

Поляковит-(Ce)

Simplified Chinese

铈鲍利雅科夫矿

Japanese

セリウムポリヤコバイト

CNMNC (IMA)-Number

IMA 1998-029

CNMNC symbol

Symbol

Pak-Ce

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

German pages

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English pages

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Russian pages

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