Ringwoodite Mineral Data

General Ringwoodite Information

Chemical Formula:

Mg2SiO4

Composition:

Molecular Weight = 140.69 gm

Magnesium 34.55 % Mg 57.29 % MgO

Silicon 19.96 % Si 42.71 % SiO₂

Oxygen 45.49 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₂(SiO₄)

Environment:

Chondrite meteorites. Polymorph of forsterite and replaces ferroan forsterite grains.

IMA Status:

Approved IMA 1969

Locality:

Tenham, Austalia, chondrite. Link to MinDat.org Location Data.

Name Origin:

Named for Alfred Edward Ringwood (1930-1993), geochemist and petrologist, Research School of Earth Sciences at the Australian National University in Canberra, Australia.

Name Pronunciation:

Ringwoodite + Pronunciation

Synonym:

ICSD 27531

PDF 21-1258

Ringwoodite Image

Images:

Ringwoodite Lingunite Majorite

Comments: BSE image showing chondritic xenoliths and impact melt veins of lingunite (Lgt). Olivine (Olv), pyroxene (Pyx), maskelynite (Ms glass), ringwoodite (Rgt), and majorite (Mjt). Meteoritics & Planetary Science 43, No 5, 823-828 (2008).
Location: Polished thin section of the Sixiangkou meteorite. Scale: See Image.
© Meteoritics & Planetary Science

Ringwoodite Crystallography

Cell Dimensions:

a = 8.113, Z = 8; V = 534.00 Den(Calc)= 3.50

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.447(1), 1.434(0.58), 2.028(0.58),

Crystal Structure:

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Baur W H , American Mineralogist , 57 (1972) p.709-731, Computer-simulated crystal structures of observed and hypothetical Mg2SiO4, polymorphs of low and high density, normal

View Additional jPOWD Structure files for Ringwoodite
[1] [10] [11] [12] [13] [2] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Ringwoodite

Color:

Blue gray, Colorless, Light violet, Purple, Smoky gray.

Density:

3.9

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Optical Properties of Ringwoodite

Gladstone-Dale:

CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.079 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2194,KPDmeas= 0.1969,KC= 0.2034
Ncalc = 1.71 - 1.79

Optical Data:

Isotropic, n=1.768.

Calculated Properties of Ringwoodite

Electron Density:

Bulk Density (Electron Density)=3.88 gm/cc
note: Specific Gravity of Ringwoodite =3.90 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Ringwoodite= 1.53 barns/electron
U=PE_Ringwoodite x rElectron Density= 5.94 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ringwoodite is Not Radioactive

Ringwoodite Classification

Dana Class:

51.03.03.01 (51)Nesosilicate Insular SiO4 Groups Only

(51.03)with all cations in octahedral [6] coordination

(51.03.03)Dana Group

51.03.03.01 Ringwoodite Mg2SiO4 F d3m 4/m 3 2/m

Strunz Class:

09.AC.15 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AC -Nesosilicates without additional anions;

09.AC.15 Ringwoodite Mg2SiO4 F d3m 4/m 3 2/m

Other Ringwoodite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Ringwoodite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Ringwoodite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Ringwoodite Specimen Label here :

Ringwoodite

Mg2SiO4
Dana No: 51.03.03.01 Strunz No: 09.AC.15
Locality:

Notes: