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Ribbeite

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Ribbeit
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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

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

Volumne (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

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Ribbeit
Google-Bilder-Suche - search for: Ribbeit
Mineralienatlas.de (Forum) - search for: Ribbeit

English pages

Mindat - search for: Ribbeite
Webmineral - search for:Ribbeite
Handbook-of-Mineralogy - search for: Ribbeite
RRUFF - Raman, XRD and other mineral data - search for: Ribbeite
RRUFF - References and PDF downloads - search for: Ribbeite
American-Mineralogist-Crystal-Structure-Database - search for: Ribbeite
Strahlen.org - search for: Ribbeite

Russian pages

Webmineral.ru - search for: Риббеит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Ribbeit
Crystal-Treasure.com - search for: Ribbeit
Bosse - search for: Ribbeit
Edelsteine Neuburg - Gundolf Fischer - search for: Ribbeit

Locations with GPS information