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Ilmajokite-(Ce) (Ilmajokit)

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Bildgröße: 8 x 5 mm; Fundort: Jubiläumspegmatit, Karnarsurt-Berg, Lovozero-Massiv, Kola-Halbinsel, Russland
Copyright: Pavel M. Kartashov
Contribution: slugslayer 2008-04-16
Locality: Jubiläumspegmatit (Yubileinaya; Yubileinoye; Jubilejnaja) / Karnasurt, Berg / Lovozero / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color strahlend gelb
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 1
Solubility +++ H2O
schon an der Atmosphäre deutlich instabil
Crystal System monoklin, C2/c
Morphology Körnig, krustig und Kristallbüschel bis 2 mm

Additional information / Summary

Ursprünglich als Ilmajokit beschieben wurde im CNMNC – Newsletter 53 (2020) die Formel angepasst und das Mineral zu Ilmajokit-(Ce) umbenannt.

Chemism

Chem­ical formula

Na11KBaCe2Ti12Si37.5O94(OH)31·29H2O

Empir­ical formula (anal­y­sis)

(Na9.55K1.09Ba0.84Ca0.08Th0.08)11.64(REE1.99-Y0.01)2(Ti11.98Ta0.05Nb0.01Mn0.01Mg0.01Fe2+0.01Zr0.01)12.08[Si37.72-Al0.03]O109,
with REE = Ce0.99La0.59Nd0.27Pr0.10Sm0.03Dy0.01.

Chem­ical com­po­si­tion

Barium, Cerium, Natrium, Silicium, Titan, Kalium, Sauerstoff, Wasserstoff

Anal­y­sis wt%

SiO2 : 35.55, TiO2 : 16.95, BaO : 2.65, La2O3 : 1.32, Ce2O3 : 2.49, Nd2O3 : 0.88, Na2O : 12.40, K2O : 0.40, H2O : 24.54, CO2 : 1.46, Ln2O3 : 4.93 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 72)

Strunz 9th edi­tion incl. updates

9.HB.05

9: Silikate (Germanate)
H: Unklassifizierte Silikate
B: Mit [Ti], [V], Cr]
05:Ilmajokit-Gruppe

Lapis Clas­sifica­tion

VIII/B.16-020

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
16: Kationen mit Koordinationszahlen zwischen [8] und [12]

Clas­sifica­tion by Hölzel

9.GB.100

9: SILICATES
G: Unknown Structures
B: with Ti, V, Cr

Dana 8th edi­tion

78.07.05.01

78: Unclassified Silicate Minerals
07: Unclassified silicates wholly unclassified silicates

IMA sta­tus

Anerkannt von der CNMNC

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

strahlend gelb

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent, durchscheinend

Lus­tre

Glasglanz

max. Birefrin­gence

0.006
Birefringence chart\! Ilmajokite-(Ce) title=Birefringence chart Ilmajokite-(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

1.573

RI value β

1.576

RI value γ / ε

1.579

Ri mean

1.576

2V angle

Biaxial (+) 90°

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell param­e­ters a (Å)

35.908 (5)

Cell param­e­ters b (Å)

27.784 (3)

Cell param­e­ters c (Å)

33.126 (4)

Cell param­e­ters a/b or c/a

1.292

Cell param­e­ters c/b

1.192

Cell param­e­ters α

90°

Cell param­e­ters β

96.494 (3)°

Cell param­e­ters γ

90°

Z

16

Volumne (ų)

32836.695

Kristall struc­ture

aufgeklärt, Andrey A. Zolotarev Jr, Sergey V. Krivovichev, Fernando Camara, Luca Bindi, Elena S. Zhitova, Frank Hawthorne, Elena Sokolova: Extraordinary structural complexity of ilmajokite: a multilevel hierarchical framework structure of natural origin. IUCrJ (2020). 7, S. 121–128.

X-Ray Pow­der Diffrac­tion

11.5(100),
10.9(70),
10.2(90),
4.3(100),
3.7(70),
3.1(90),
2.48(70),
2.44(100)
XRD chart Ilmajokite-(Ce)

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

Morphol­ogy

Körnig, krustig und Kristallbüschel bis 2 mm

Crystals 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

1

Density (g/cm³)

2.2 (gemessen) 2.23 (berechnet)

Insta­bil­ity

+++ H2O
schon an der Atmosphäre deutlich instabil

(Co-)Type locality

(Co-)Type locality

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

Preface

Occurrences

An Drusenrändern der zentralen Natrolith-Zone im Ilmajok-Flusstal, Lovozero Alkalimassiv, Kola Halbinsel, Russland

Asso­cia­tions

Ägirin, Sphalerit, Halit, Mountainit, Natrolith

Rare­ness

selten

Name from

dem Fluss Ilmajok, der in der Nähe der Typlokalität verläuft

Author (Name, Year)

Bussen & Gannibal & Goyko & Mer'kov & Nedorezova, 1972

References

Bussen I V, Gannibal L F, Goiko E A, Mer'kov A N, Nedorezova A P (1972) Ilmajokite, a new mineral from the Lovozero Tundra, Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 101(1), 75-79

CNMNC Newsletter 53, Eur. J. Mineral., 32, https://doi.org/10.5194/ejm-32-209-2020, 2020 [Neue Formel, Namensaenderung]

Andrey A. Zolotarev Jr, Sergey V. Krivovichev, Fernando Camara, Luca Bindi, Elena S. Zhitova, Frank Hawthorne, Elena Sokolova: Extraordinary structural complexity of ilmajokite: a multilevel hierarchical framework structure of natural origin. IUCrJ (2020). 7, S. 121–128. https://doi.org/10.1107/S2052252519016622

Other languages

German

Ilmajokit-(Ce)

Spanish

Ilmajokita-(Ce)

French

Ilmajokite-(Ce)

English

Ilmajokite-(Ce)

Russian

Ильмайокит-(Ce)

Alternative Name

German

Ilmajokit

Lapis-Mineralienverzeichnis 2018

CNMNC (IMA)-Number

IMA 1971-027

CNMNC symbol

Symbol

Ijk-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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German pages

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