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Ringwoodite (Ringwoodit)

Collectors Summary

Color bläulichgrau, purpur
Crystal System kubisch, Fd3m

Chemism

Chemical formula

(Mg,Fe2+)2SiO4

Chemical composition

Eisen, Magnesium, Silicium, Sauerstoff

Unit weight: 156.46344 u; Number of atoms in the formula: 7

Info

Empirical formula:

(Mg0.75Fe0.25)2SiO4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

40.90

4

57.14

15.9994300

63.9977200
Magnesium

Mg

23.30

1.5

21.43

24.3050600

36.4575900
Silicon

Si

17.95

1

14.29

28.0855300

28.0855300
Iron

Fe

17.85

0.5

7.14

55.8452000

27.9226000

Analysis wt%

Ø SiO2 : 38.80, FeO : 23.30, MgO : 37.90 (Ref: Nature,69)

Strunz 9th edition incl. updates

9.AC.15

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
C: Insel(Neso)silikate ohne weitere Anionen; Kationen in oktahedraler [6] Koordination
15:Ringwoodit-Gruppe

Lapis Classification

VIII/A.06-020

VIII: SILIKATE
A: Inselsilikate mit [SiO4] 4--Baugruppen
6: Kationen in oktaedrischer Koordination [6]

Classification by Hölzel

9.AB.300

9: SILICATES
A: Nesosilicates
B: Olivine-Group

Dana 8th edition

51.03.03.01

51: Nesosilicate Minerals
03: Nesosilicates Nesosilicate Insular SiO4 Groups Only with all cations in octahedral [6] coordination

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Spinel supergroup  ⇒ Oxyspinel group  ⇒ Ulvöspinel subgroup

Optical Properties

Color

bläulichgrau, purpur

RI value α / ω / n

1.768

Ri mean

1.768

2V angle

Isotropisch

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

227

Space Group

Fd3m

Cell parameters a (Å)

8.113

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

1

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volume (ų)

534.004

X-Ray Powder Diffraction

2.871(20),
2.451(100),
2.031(40),
1.563(20),
1.437(60),
1.056(10),
1.016(10),
0.829(10)
XRD chart Ringwoodite

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

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

3.90 (berechnet)

3.892 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Australien/Queensland/South Gregory/Tenham-Meteorit

Preface

Author (Name, Year)

Binns & Davis & Reed, 1969

References

Nature 221 (1969), 943.

Sofia Lorenzon; Davide Novella; Paolo Nimis; Steven D. Jacobsen; Emilie Thomassot, Martha G. Pamato; Loredana Prosperi; Alessandra Lorenzetti; Matteo Alvaro; Frank Brenker; Franco Salvadego; Fabrizio Nestola: Ringwoodite and zirconia inclusions indicate downward travel of super-deep diamonds. Geology Vol. 50, Nr. 9 (2022) S. 996-1000. Open Access

IMA group assignments

Other languages

German

Ringwoodit

Spanish

Ringwoodita

French

Ringwoodite

English

Ringwoodite

Russian

Рингвудит

Simplified Chinese

林伍德石

CNMNC (IMA)-Number

IMA 1968-036

CNMNC symbol

Symbol

Rwd

Locations with GPS information

IDs

GUSID (Global unique identifier short form) gjr3OT5KSE-OwTerAcl0cA
GUID (Global unique identifier) 39F73A82-4A3E-4F48-8EC1-37AB01C97470
Database ID 3278