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Chegemite

Pictures (1 Images total)

Chegemit
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Chegemit
rosafarbene, derbe Massen von Chegemit, Lakargi, Obere Chegem Caldera, Kabardino-Balkarien, Nordkaukasus, Russland; BB ~ 1 cm, analysiert
Copyright: mintreasure.com; Contribution: openpit
Location: Russland/Nordkaukasus, Föderationskreis/Kabardino-Balkarien, Republik/Obere vulkanische Chegem-Struktur (Verkhnechegemskaya Caldera)/Lakargi-Gebirge
Mineral: Chegemite
Image: 1681048939
License: Usage for Mineralienatlas project only
Chegemit

rosafarbene, derbe Massen von Chegemit, Lakargi, Obere Chegem Caldera, Kabardino-Balkarien, Nordkaukasus, Russland; BB 1 cm, analysiert
Copyright: mintreasure.com
Contribution: openpit 2023-04-09
Locality: Lakargi-Gebirge / Obere vulkanische Chegem-Struktur (Verkhnechegemskaya Caldera) / Kabardino-Balkarien, Republik / Nordkaukasus, Föderationskreis / Russland

Collectors Summary

Crystal System orthorhombisch, Pbnm

Chemism

Chemical formula

Ca7(SiO4)3(OH)2

Additional chem. information

Humit Gruppe

Chemical composition

Calcium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 590.813304 u; Number of atoms in the formula: 26

Info

Empirical formula:

Ca7(SiO4)3(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.34

2

7.69

1.0079470

2.0158940
Oxygen

O

37.91

14

53.85

15.9994300

223.9920200
Silicon

Si

14.26

3

11.54

28.0855300

84.2565900
Calcium

Ca

47.49

7

26.92

40.0784000

280.5488000

Analysis wt%

SiO2 : 30.30, CaO : 66.17, H2O : 2.26, F : 1.67 (Ref: European Journal of Mineralogy 2009)

Strunz 9th edition incl. updates

9.AF.50

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
F: Insel(Neso)silikate mit zusätzlichem Anionen; Kationen in [4], [5] und/oder nur [6] Koordination
50:Humit-Gruppe

Lapis Classification

VIII/B.04-095

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
4: Kationen in tetraedrischer oder oktaedrischer Koordination [4/6]; Humit-Gruppe

Classification by Hölzel

9.AI.260

9: SILICATES
A: Nesosilicates
I: Nesosilicates with OH
2: Norbergite-Group

IMA status

Neue Mineralien Nov. 2008 - IMA-WEB-Seite [anerkannt]

Mineral status

anerkanntes Mineral

Optical Properties

max. Birefringence

0.009
Birefringence chart\! Chegemite title=Birefringence chart Chegemite

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

1.621

RI value β

1.626

RI value γ / ε

1.630

Ri mean

1.626

2V angle

Biaxial (-) 80°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pbnm

Cell parameters a (Å)

5.070

Cell parameters b (Å)

11.396

Cell parameters c (Å)

23.557

Cell parameters a/b or c/a

0.445

Cell parameters c/b

2.067

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

1361.07

X-Ray Powder Diffraction

5.611(43), 3.646(41), 3.041(65), 2.837(60), 2.728(74), 2.557(43), 2.520(59), 1.910(100)
XRD chart Chegemite

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

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.892 (berechnet)

2.883 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Russland/Nordkaukasus, Föderationskreis/Kabardino-Balkarien, Republik/Obere vulkanische Chegem-Struktur (Verkhnechegemskaya Caldera)/Lakargi-Gebirge

Preface

Author (Name, Year)

Evgeny V. Galuskin, 2008

References

Neue Mineralien Nov. 2008 - IMA-WEB-Seite [anerkannt]

Other languages

German

Chegemit

Spanish

Chegemita

English

Chegemite

Russian

Чегемит

CNMNC (IMA)-Number

IMA 2008-038

CNMNC symbol

Symbol

Cgm

Locations with GPS information

IDs

GUSID (Global unique identifier short form) GAdw2R1hOUCrdhV8GQ87oA
GUID (Global unique identifier) D9700718-611D-4039-AB76-157C190F3BA0
Database ID 5087