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Combeite

Pictures (2 Images total)

Combeit
Views (File:
1702842387
): 80
Combeit
Blassrosa Combeit-Kristallaggregate, ohne Maßstab, FO: Mt. Oldoinyo Lengai, Arusha Region, Tansania.
Copyright: Wikipedia-user: David Hospital; Contribution: oliverOliver
Location: Tansania/Arusha, Region/Oldoinyo Lengai (Ol Doinyo Lengai) Vulkan
Mineral: Combeite
Image: 1702842387
License: Creative Commons - Attribution-ShareAlike 4.0 International  (CC BY-SA) V.4.0
Combeit

Blassrosa Combeit-Kristallaggregate, ohne Maßstab, FO: Mt. Oldoinyo Lengai, Arusha Region, Tansania.
Copyright: Wikipedia-user: David Hospital
Contribution: oliverOliver 2023-12-17
Locality: Oldoinyo Lengai (Ol Doinyo Lengai) Vulkan / Arusha, Region / Tansania
Combeit
Views (File:
1300971419
): 1927
Combeit
Grauer, glasiger Combeit neben Calcio-Olivin u.a. vom Steinbruch Bellerberg, Ettringen, Eifel, Rheinland-Pfalz, Deutschland. Bildbreite: 3 mm.
Copyright: raritätenjäger; Contribution: raritätenjäger
Collection: raritätenjäger
Location: Deutschland/Rheinland-Pfalz/Mayen-Koblenz-Kreis/Vordereifel, Verbandsgemeinde/Ettringen/Bellerberg/Ettringer Bellerberg (Stbr. Caspar)
Mineral: Combeite
Image: 1300971419
Rating: 1 (votes: 1)
License: Usage for Mineralienatlas project only
Combeit

Grauer, glasiger Combeit neben Calcio-Olivin u.a. vom Steinbruch Bellerberg, Ettringen, Eifel, Rheinland-Pfalz, Deutschland. Bildbreite: 3 mm.
Collection: raritätenjäger
Copyright: raritätenjäger
Contribution: raritätenjäger 2011-03-24
Locality: Ettringer Bellerberg (Stbr. Caspar) / Bellerberg / Ettringen / Vordereifel, Verbandsgemeinde / Mayen-Koblenz-Kreis / Rheinland-Pfalz / Deutschland

You find additional specimen at the Geolitho Museum

Collectors Summary

Color rosa, leuchtend rosa, silbern, gelb, braun
Streak color weiß
Solubility +++ heiße verdünnte HCl
Crystal System trigonal, P3121

Chemism

Chemical formula

Na2Ca2Si3O9

Chemical composition

Calcium, Natrium, Silicium, Sauerstoff

Unit weight: 354.3878004 u; Number of atoms in the formula: 16

Info

Empirical formula:

Na2Ca2Si3O9

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

40.63

9

56.25

15.9994300

143.9948700
Sodium

Na

12.97

2

12.50

22.9897702

45.9795404
Silicon

Si

23.78

3

18.75

28.0855300

84.2565900
Calcium

Ca

22.62

2

12.50

40.0784000

80.1568000

Analysis wt%

SiO2 : 49.78, ZrO2 : 0.44, Al2O3 : 2.45, Fe2O3 : 1.86, FeO : 0.54, MnO : 0.58, MgO : 0.41, CaO : 22.68, Na2O : 16.14, K2O : 1.18, F : 1.87, H2O : 1.81 (Ref: Mineralogical Magazine 57)

Strunz 9th edition incl. updates

9.CJ.15

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

Lapis Classification

VIII/E.15-010

VIII: SILIKATE
E: Ringsilikate
15: Sechserringe [Si6O18] 12-

Classification by Hölzel

9.CD.160

9: SILICATES
C: Cyclosilicates
D: ~[Si6O18]-rings, without borate
1: Zirsinalite-Lovozerite-Subgroup - Cation-saturated members (with occupied B-site)

Dana 8th edition

61.01.02a.05

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

IMA status

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Lovozerite group  ⇒ Zirsinalite-Lovozerite subgroup

Optical Properties

Color

rosa, leuchtend rosa, silbern, gelb, braun

Streak color

weiß

Diaphaneity (Transparency)

transparent bis durchscheinend bis opak

max. Birefringence

0.002
Birefringence chart\! Combeite title=Birefringence chart Combeite

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

1.599

RI value γ / ε

1.597

Ri mean

1.598

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

32

Space Group number

152

Space Group

P3121

Cell parameters a (Å)

10.429

Cell parameters b (Å)

-

Cell parameters c (Å)

13.149

Cell parameters a/b or c/a

1.261

Cell parameters c/b

-

Z

6

Volume (ų)

1238.536

X-Ray Powder Diffraction

4.380(30),
3.722(50),
3.354(40),
3.304(70),
2.657(100),
2.607(80),
1.861(40),
1.544(20)
XRD chart Combeite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.64 - 2.84 / Durchschnittlich = 2.74

2.851 ( ρ calc. Mineralienatlas )

Instability

+++ heiße verdünnte HCl

(Co-)Type locality

(Co-)Type locality

Demokratische Republik Kongo/Nord-Kivu, Provinz/Goma/Nyiragongo-Vulkan/Mt. Saheru

Preface

Author (Name, Year)

Sahama & Hytönen, 1957

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 158

IMA group assignments

Other languages

German

Combeit

English

Combeite

French

Combeite

Spanish

Combeíta

Russian

Комбит

Alternative Name

H-Combeite

Mourmanit

Mourmanita

Mourmanite

CNMNC symbol

Symbol

Cbe

Locations with GPS information

IDs

GUSID (Global unique identifier short form) gCkxpRtvU0-T5IovJ6luFw
GUID (Global unique identifier) A5312980-6F1B-4F53-93E4-8A2F27A96E17
Database ID 799