Mineralogy Database

Ringwoodite Mineral Data

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General Ringwoodite Information

Help on Chemical  Formula: Chemical Formula: Mg2SiO4
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mg2(SiO4)
Help on Environment: Environment: Chondrite meteorites. Polymorph of forsterite and replaces ferroan forsterite grains.
Help on IMA Status: IMA Status: Approved IMA 1969
Help on Locality: Locality: Tenham, Austalia, chondrite. Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Name Pronunciation: Name Pronunciation: Ringwoodite + Pronunciation Say RINGWOODITE
Help on Synonym: Synonym: ICSD 27531
  PDF 21-1258

Ringwoodite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Lingunite   Ringwoodite   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

Help on Cell Dimensions: Cell Dimensions: a = 8.113, Z = 8; V = 534.00 Den(Calc)= 3.50
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.447(1), 1.434(0.58), 2.028(0.58),

Physical Properties of Ringwoodite

Help on Color: Color: Blue gray, Colorless, Light violet, Purple, Smoky gray.
Help on Density: Density: 3.9
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.

Optical Properties of Ringwoodite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Isotropic, n=1.768.

Calculated Properties of Ringwoodite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.88 gm/cc
note: Specific Gravity of Ringwoodite =3.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PERingwoodite = 1.53 barns/electron
U=PERingwoodite x rElectron Density= 5.94 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ringwoodite is Not Radioactive

Ringwoodite Classification

Help on  Dana Class: Dana Class: (51)Nesosilicate Insular SiO4 Groups Only
  (51.03)with all cations in octahedral [6] coordination
  (51.03.03)Dana Group Ringwoodite Mg2SiO4 F d3m 4/m 3 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 09.AC.15





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