Wadsleyite Mineral Data

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General Wadsleyite Information

Chemical Formula:

(Mg,Fe++)2SiO4

Composition:

Molecular Weight = 156.46 gm

Magnesium 23.30 % Mg 38.64 % MgO

Iron 17.85 % Fe 22.96 % FeO

Silicon 17.95 % Si 38.40 % SiO₂

Oxygen 40.90 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_1.5Fe²⁺_0.5SiO₄

Environment:

In fragments within a vein in a "hypersthene"-olivine chondritic meteorite, believed to have formed during an extraterrestrial shock event.

IMA Status:

Approved IMA 1983

Locality:

Peace River meteorite. Link to MinDat.org Location Data.

Name Origin:

Named for A.D. Wadsley (1918-1969).

Name Pronunciation:

Wadsleyite + Pronunciation

Synonym:

ICSD 66490

IMA1982-012

PDF 37-415

Wadsleyite Image

Images:

Wadsleyite

Comments: Synthetic wadsleyite crystals.
Location: None, laboratory grown. Scale: See Image.
© Rruff Database

Wadsleyite Crystallography

Axial Ratios:

a:b:c =0.4896:1:0.713

Cell Dimensions:

a = 5.6715, b = 11.582, c = 8.258, Z = 8; beta = 90.397° V = 542.43 Den(Calc)= 3.83

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m

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

By Intensity(I/I_o): 2.45(1), 2.04(0.7), 1.44(0.6),

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

View Additional jPOWD Structure files for Wadsleyite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [3] [30] [31] [32] [33] [34] [4] [5] [6] [7] [8] [9]

Physical Properties of Wadsleyite

Color:

Light gray.

Density:

3.84

Optical Properties of Wadsleyite

Gladstone-Dale:

CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1984,KPDmeas= 0.1979,KC= 0.2003
Ncalc = 1.77

Optical Data:

Biaxial (?), b=1.76

Calculated Properties of Wadsleyite

Electron Density:

Bulk Density (Electron Density)=3.77 gm/cc
note: Specific Gravity of Wadsleyite =3.83 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Wadsleyite= 6.48 barns/electron
U=PE_Wadsleyite x rElectron Density= 24.43 barns/cc.

Radioactivity:

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

Wadsleyite Classification

Dana Class:

51.03.04.01 (51)Nesosilicate Insular SiO4 Groups Only

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

(51.03.04)Dana Group

51.03.04.01 Wadsleyite (Mg,Fe)2SiO4 I2/m 2/m

Strunz Class:

09.BE.02 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.02 Wadsleyite (Mg,Fe)2SiO4 I2/m 2/m

Other Wadsleyite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.82,p270-275,1997) OPTIC PROP.(Am.Min.,Vol.82,p270-275,1997)

See Also:

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

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Ask about Wadsleyite here :
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Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Wadsleyite Specimen Label here :

Wadsleyite

(Mg,Fe++)2SiO4
Dana No: 51.03.04.01 Strunz No: 09.BE.02
Locality:

Notes: