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Imandrite (Imandrit)

Pictures (1 Images total)

Imandrit
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Imandrit
bräunlicher Kristall von Imandrit mit unbekanntem, weißen Überzug, Vuonnemiok Flusstal, Chibiny, Kola, Russland; BB ~ 3 mm, analysiert
Copyright: Joy Desor; Contribution: openpit
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Chibiny (Khibiny)/Vuonnemiok-Flusstal
Mineral: Imandrite
Image: 1581442703
License: Usage for Mineralienatlas project only
Imandrit

bräunlicher Kristall von Imandrit mit unbekanntem, weißen Überzug, Vuonnemiok Flusstal, Chibiny, Kola, Russland; BB 3 mm, analysiert

Copyright: Joy Desor
Contribution: openpit 2020-02-11
Locality: Vuonnemiok-Flusstal / Chibiny (Khibiny) / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color honiggelb
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 4
Crystal System orthorhombisch, Pmnn
Morphology Unregelmässige Körner von 1-3 mm

Chemism

Chemical formula

Na12Ca3Fe23+Si12O36

Chemical composition

Calcium, Eisen, Natrium, Silicium, Sauerstoff

Unit weight: 1420.8086824 u; Number of atoms in the formula: 65

Info

Empirical formula:

Na12Ca3Fe2Si12O36

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

40.54

36

55.38

15.9994300

575.9794800

Sodium

Na

19.42

12

18.46

22.9897702

275.8772424

Silicon

Si

23.72

12

18.46

28.0855300

337.0263600

Calcium

Ca

8.46

3

4.62

40.0784000

120.2352000

Iron

Fe

7.86

2

3.08

55.8452000

111.6904000

Analysis wt%

SiO2 : 50.95, TiO2 : 0.95, ZrO2 : 1.43, Fe2O3 : 5.47, MnO : 2.30, CaO : 12.00, Na2O : 26.66 (Ref: Mineralogicheskii Zhurnal 79)

Strunz 9th edition incl. updates

9.CJ.20

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
J: ~[Si6O18]12- sechser-Einfachringe, ohne inselartig, komplexe [Anionen]
20:Imandrit-Gruppe

Lapis Classification

VIII/E.16-010

VIII: SILIKATE
E: Ringsilikate
16: Sechserringe [Si6O18] 12-; Lovozerit-Gruppe

Classification by Hölzel

9.CD.350

9: SILICATES
C: Cyclosilicates
D: ~[Si6O18]-rings, without borate
3: Koashvite-Imandrite-Subgroup

Dana 8th edition

61.01.02b.01

61: Cyclosilicates Cyclosilicate Six-Membered Rings
01: Cyclosilicates Cyclosilicate Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
02b: Lovozerite group (Ortho and MON subgroup)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Lovozerite group  ⇒ Imandrite subgroup

Optical Properties

Color

honiggelb

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.007

Birefringence chart\! Imandrite title=Birefringence chart Imandrite

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

1.605

RI value β

1.608

RI value γ / ε

1.612

Ri mean

1.608

2V angle

Biaxial (+) 72°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

58

Space Group

Pmnn

Cell parameters a (Å)

7.426

Cell parameters b (Å)

10.546

Cell parameters c (Å)

10.331

Cell parameters a/b or c/a

0.704

Cell parameters c/b

0.980

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

1

Volume (ų)

809.068

X-Ray Powder Diffraction

3.97(30),
3.73(50),
3.33(60),
3.29(20),
2.63(100),
2.59(20),
1.853(70),
1.520(50)

XRD chart Imandrite

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

Morphology

Unregelmässige Körner von 1-3 mm

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4

VHN (Hardness Vickers)

190 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.93

2.916 ( ρ calc. Mineralienatlas )

Preface

Occurrences

Isolierte Körner, Ränder um Eudialith sowie Miarolen in Alkalipegmatiten des Chibiny-Massivs, Kola Halbinsel, Russland

Associations

Adular, Alkaliamphibole, Ägirin u.a.

Rareness

sehr selten

Author (Name, Year)

Khomyakov & Chernitsova & Sandomirskaya & Vasil'eva, 1979

Collector information

Benannt nach dem Imandra-See (Chibiny )

References

Mineralogicheskiy Zhurnal 1 (1979) (1), 89

IMA group assignments

Other languages

German

Imandrit

Spanish

Imandrita

English

Imandrite

French

Imandrite

Russian

Имандрит

Alternative Name

Imandrita

CNMNC (IMA)-Number

IMA 1979-025

CNMNC symbol

Symbol

Ima

Locations with GPS information

IDs

GUSID (Global unique identifier short form) bt2e2p2nrkywoNSvNvvoLA
GUID (Global unique identifier) DA9EDD6E-A79D-4CAE-B0A0-D4AF36FBE82C
Database ID 1711