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Ribbeite

Pictures (2 Images total)

Ribbeit
Views (File:
1588966789
): 215
Ribbeit
pinkes Aggregat von Ribbeit, Kombat Mine, Grootfontein, Otjozondjupa, Namibia; BB ~ 2 mm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Namibia/Otjozondjupa, Region/Grootfontein, Kreis/Kombat Mine
Mineral: Ribbeite
Image: 1588966789
License: Usage for Mineralienatlas project only
Ribbeit

pinkes Aggregat von Ribbeit, Kombat Mine, Grootfontein, Otjozondjupa, Namibia; BB 2 mm

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-05-08
Locality: Kombat Mine / Grootfontein, Kreis / Otjozondjupa, Region / Namibia
Ribbeit, McGovernit, Galaxit
Views (File:
1679295293
): 91
Ribbeit, McGovernit, Galaxit
Diese etwa 14 mm x 13 mm große Stufe aus der Kombat Mine in Namibia zeigt rosafarbenen Ribbeit, bräunlichen McGovernit und schwarzen Galaxit.
Copyright: Klaus Schäfer; Contribution: Klaus Schäfer
Collection: Klaus Schäfer, Collection number: SyS-Ribb-2-2-1
Location: Namibia/Otjozondjupa, Region/Grootfontein, Kreis/Kombat Mine
Mineral: Galaxite, Mcgovernite, Ribbeite
Image: 1679295293
License: Usage for Mineralienatlas project only
Ribbeit, McGovernit, Galaxit (SNr: SyS-Ribb-2-2-1)

Diese etwa 14 mm x 13 mm große Stufe aus der Kombat Mine in Namibia zeigt rosafarbenen Ribbeit, bräunlichen McGovernit und schwarzen Galaxit.

Collection: Klaus Schäfer
Copyright: Klaus Schäfer
Contribution: Klaus Schäfer 2023-03-20
Locality: Kombat Mine / Grootfontein, Kreis / Otjozondjupa, Region / Namibia

Collectors Summary

Color rosa
Streak color rötlichweiß
Hardness (Mohs) 5
Crystal System orthorhombisch, Pnam

Chemism

Chemical formula

(Mn2+,Mg)5(SiO4)2(OH)2

Chemical composition

Magnesium, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 454.580266125 u; Number of atoms in the formula: 19

Info

Empirical formula:

(Mn0.75Mg0.25)5(SiO4)2(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.44

2

10.53

1.0079470

2.0158940

Oxygen

O

35.20

10

52.63

15.9994300

159.9943000

Magnesium

Mg

6.68

1.25

6.58

24.3050600

30.3813250

Silicon

Si

12.36

2

10.53

28.0855300

56.1710600

Manganese

Mn

45.32

3.75

19.74

54.9380499

206.0176871

Strunz 9th edition incl. updates

9.AF.65

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

Lapis Classification

VIII/B.04-050

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

Classification by Hölzel

9.AI.220

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

Dana 8th edition

52.03.02b.04

52: Nesosilicates Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
03: Nesosilicates Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
02b: Humite group (Chondrodite series)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

rosa

Streak color

rötlichweiß

max. Birefringence

0.028

Birefringence chart\! Ribbeite title=Birefringence chart Ribbeite

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

1.780

RI value β

1.792

RI value γ / ε

1.808

Ri mean

1.793

2V angle

Biaxial (+) 83°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pnam

Cell parameters a (Å)

10.732

Cell parameters b (Å)

15.672

Cell parameters c (Å)

4.811

Cell parameters a/b or c/a

0.685

Cell parameters c/b

0.307

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

809.171

X-Ray Powder Diffraction

2.925(70),
2.873(80),
2.821(70),
2.695(60),
2.552(80),
2.515(40),
2.356(40),
1.796(100)

XRD chart Ribbeite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.90 (gemessen)

3.731 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Peacor & Dunn & Su & Innes, 1987

References

American Mineralogist 72 (1987), 213

Other languages

German

Ribbeit

English

Ribbeite

French

Ribbeite

Spanish

Ribbeíta

Russian

Риббеит

CNMNC (IMA)-Number

IMA 1985-045

CNMNC symbol

Symbol

Rib

Locations with GPS information

IDs

GUSID (Global unique identifier short form) qKc-z5A_KkKijRQP93D5pw
GUID (Global unique identifier) CF3EA7A8-3F90-422A-A28D-140FF770F9A7
Database ID 3269