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Voronkovite (Voronkovit)

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Voronkovit
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Voronkovit
Fragment von Voronkovit, Alluaiv, Lovozero, Kola-Halbinsel, Russland, BB < 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Lovozero/Alluaiv
Mineral: Voronkovite
Image: 1576954174
License: Usage for Mineralienatlas project only
Voronkovit

Fragment von Voronkovit, Alluaiv, Lovozero, Kola-Halbinsel, Russland, BB < 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2019-12-21
Locality: Alluaiv / Lovozero / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

You find additional Voronkovit specimen at the Geolitho Museum

Collectors Summary

Hardness (Mohs) 5
Cleavages keine
Fracture muschelig
Solubility +++ Säuren
Crystal System trigonal, R3

Chemism

Chemical formula

Na15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl·H2O

Chemical composition

Calcium, Cerium, Chlor, Eisen, Mangan, Natrium, Silicium, Zirconium, Sauerstoff, Wasserstoff

Unit weight: 3061.883966635 u; Number of atoms in the formula: 136

Info

Empirical formula:

Na15(Na0.6Ca0.3Ce0.1)3(Mn0.75Ca0.25)3Fe3Zr3Si26O72((OH)0.75O0.25)4Cl·H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.16

5

3.68

1.0079470

5.0397350
Oxygen

O

40.24

77

56.62

15.9994300

1,231.9561100
Sodium

Na

12.61

16.8

12.35

22.9897702

386.2281394
Silicon

Si

23.85

26

19.12

28.0855300

730.2237800
Chlorine

Cl

1.16

1

0.74

35.4532000

35.4532000
Calcium

Ca

2.16

1.65

1.21

40.0784000

66.1293600
Manganese

Mn

4.04

2.25

1.65

54.9380499

123.6106123
Iron

Fe

5.47

3

2.21

55.8452000

167.5356000
Zirconium

Zr

8.94

3

2.21

91.2242000

273.6726000
Cerium

Ce

1.37

0.3

0.22

140.1161000

42.0348300

Analysis wt%

SiO2 : 49.48, Nb2O5 : 0.91, ZrO2 : 14.11, FeO : 3.53, MnO : 4.65, La2O3 : 0.93, Ce2O3 : 1.36, Nd2O3 : 0.68, SrO : 1.76, CaO : 3.08, Na2O : 15.84, Cl : 0.44, H2O : 1.56, Ln2O3 : 2.97 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 2009)

Strunz 9th edition incl. updates

9.CO.10

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
O: ~[Si9O27]18- neuner-Ringe
10:Eudialyt-Gruppe

Lapis Classification

VIII/E.25-038

VIII: SILIKATE
E: Ringsilikate
25: Neunerringe + Dreierringe; Eudialyt-Gruppe

Classification by Hölzel

9.CG.205

9: SILICATES
C: Cyclosilicates
G: ~[Si3O9]6-- + ~[Si9O27]18--Rings Eudialyte-Group
2: Eudialyte-Subgroup - c=30, Mn- Series

IMA status

anerkannt, Neue Mineralien September 2007

Mineral status

anerkanntes Mineral

Optical Properties

max. Birefringence

0.009
Birefringence chart\! Voronkovite title=Birefringence chart Voronkovite

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

1.610

RI value γ / ε

1.619

Ri mean

1.613

2V angle

Uniaxial (+)

Crystallography

Crystal System

trigonal

Class (H-M)

3

Space Group number

146

Space Group

R3

Cell parameters a (Å)

14.205

Cell parameters b (Å)

-

Cell parameters c (Å)

30.265

Cell parameters a/b or c/a

2.131

Cell parameters c/b

-

Z

3

Volumne (ų)

5288.759

X-Ray Powder Diffraction

4.316(85), 3.536(41), 3.221(43), 3.166(37), 3.039(41), 2.970(100), 2.848(84), 2.157(34)
XRD chart Voronkovite

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

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.97

2.884 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

muschelig

Tenacity

spröde

Instability

+++ Säuren

(Co-)Type locality

(Co-)Type locality

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Lovozero/Alluaiv

Preface

Name from

Alexander Alexandrovich Voronkov, Kristallograph

Author (Name, Year)

Alexander P. Khomyakov, 2007

References

IMA WEB-Seite, Neue Mineralien September 2007

Other languages

German

Voronkovit

English

Voronkovite

Russian

Воронковит

CNMNC (IMA)-Number

IMA 2007-023

CNMNC symbol

Symbol

Vrk

Locations with GPS information