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Ikranite (Ikranit)

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Ikranit in Aegirin
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Ikranit in Aegirin
Bildbreite: 13 mm; Fundort: Karnasurt, Lovozero-Massiv, Kola, Russland
Copyright: Pavel M. Kartashov; Contribution: slugslayer
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Lovozero/Karnasurt, Berg
Mineral: Ikranite
Image: 1243694958
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Ikranit in Aegirin

Bildbreite: 13 mm; Fundort: Karnasurt, Lovozero-Massiv, Kola, Russland

Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-05-30
Locality: Karnasurt, Berg / Lovozero / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color bräunlichgelb bis hellbraun
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 5
Cleavages unvollkommen
Fracture muschelig
Crystal System trigonal, R3m

Chemism

Chemical formula

(Na,H3O)15(Ca,Mn)6Fe23+Zr3-4[Cl|{Si3O6(O,OH)3}2|(Si9O27)2·0-1 SiO] ·2-3 H2O

Chemical composition

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

Unit weight: 2948.78424035 u; Number of atoms in the formula: 141.25

Info

Empirical formula:

(Na0.75(H3O)0.25)15(Ca0.75Mn0.25)6Fe2Zr3.5[Cl{Si3O6(O0.75(OH)0.25)3}2(Si9O27)2·0.5SiO]·2.5H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.50

14.75

10.44

1.0079470

14.8672183

Oxygen

O

42.19

77.75

55.04

15.9994300

1,243.9556825

Sodium

Na

8.77

11.25

7.96

22.9897702

258.6349148

Silicon

Si

23.81

25

17.70

28.0855300

702.1382500

Chlorine

Cl

1.20

1

0.71

35.4532000

35.4532000

Calcium

Ca

6.12

4.5

3.19

40.0784000

180.3528000

Manganese

Mn

2.79

1.5

1.06

54.9380499

82.4070749

Iron

Fe

3.79

2

1.42

55.8452000

111.6904000

Zirconium

Zr

10.83

3.5

2.48

91.2242000

319.2847000

Analysis wt%

SiO2 : 48.91, ZrO2 : 13.94, Fe2O3 : 4.80, MnO : 3.40, La2O3 : 0.62, Ce2O3 : 1.53, CaO : 6.29, SrO : 1.61, Na2O : 7.95, K2O : 0.44, Cl : 0.89, H2O : 7.70, Ln2O3 : 2.34 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 2003)

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.25-014

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

Classification by Hölzel

9.CG.150

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

Dana 8th edition

64.01.01.08

64: Cyclosilicates Cyclosilicates
01: Cyclosilicates Cyclosilicates Cyclosilicate Rings with Other Anions and Insular Silicate Groups with mixed ring types
01: Eudialyte Group

IMA Classification

IMA Classification

Eudialyte group

Optical Properties

Color

bräunlichgelb bis hellbraun

Streak color

weiß

Lustre

Glasglanz

max. Birefringence

0.003

Birefringence chart\! Ikranite title=Birefringence chart Ikranite

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

1.612

RI value γ / ε

1.615

Ri mean

1.613

2V angle

Uniaxial (+)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

160

Space Group

R3m

Cell parameters a (Å)

14.167

Cell parameters b (Å)

-

Cell parameters c (Å)

30.081

Cell parameters a/b or c/a

2.123

Cell parameters c/b

-

Z

3

Volumne (ų)

5228.519

X-Ray Powder Diffraction

6.41(40),
4.30(90),
4.09(40),
3.521(60),
3.205(40),
2.963(80),
2.841(100),
2.588(40)

XRD chart Ikranite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.82

2.809 ( ρ calc. Mineralienatlas )

Cleavages

unvollkommen

Fracture

muschelig

Tenacity

spröde

IMA group assignments

Other languages

German

Ikranit

English

Ikranite

Russian

Икранит

Simplified Chinese

尹克然石

Alternative Name

Unnamed (Hydronium-bearing Eudialyte)

CNMNC (IMA)-Number

IMA 2000-010

CNMNC symbol

Symbol

Ikr

Locations with GPS information