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|Name:||Named in honor of David Arthur Wadsley (1918-1969), Australian solid-state chemist and crystallographer, former research scientist of the Commonwealth Scientific and Industrial Research Organization (CSIRO), Australia, for his significant contributions to crystallography, including the concept of crystallographic shearing.|
The orthorhombic, high-pressure polymorph of Ringwoodite and Forsterite (a member of the Olivine group of minerals). Initially found in the Peace River meteroite (from Alberta, Canada), it is thought to be formed from the transformation of Olivine during an extraterrestrial shock event (eg meteorite impact). It is known to be stable in the transition zone of the Earth's upper mantle (between 400 and 525km depth).
Recent lab experiments, published in 2009, led by Thomas Ahrens at the California Institute of Technology (Caltech) have been able to replicate the formation of Wadsleyite by launching a high-velocity tantalum projectile at a sample containing magnesium oxide and silicon dioxide (Quartz)
Classification of Wadsleyite
|IMA status:||Approved 1982|
|Strunz 8th edition ID:||8/A.06-10|
|Nickel-Strunz 10th (pending) edition ID:||9.BE.02|
9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral  and greater coordination
|Dana 8th edition ID:||18.104.22.168|
51 : NESOSILICATES Insular SiO4 Groups Only
3 : Insular SiO4 Groups Only with all cations in octahedral  coordination
|Hey's CIM Ref.:||14.21.3|
14 : Silicates not Containing Aluminum
21 : Silicates of Fe and Mg
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Type Occurrence of Wadsleyite
|Type Locality:||Peace River meteorite, Peace River, Alberta, Canada|
|Year of Discovery:||1966|
Physical Properties of Wadsleyite
Crystallography of Wadsleyite
|Cell Parameters:||a = 5.7Å, b = 11.71Å, c = 8.24Å|
|Ratio:||a:b:c = 0.487 : 1 : 0.704|
|Unit Cell Volume:||V 550.00 Å³ (Calculated from Unit Cell)|
Optical Data of Wadsleyite
|Dispersion:||r > v|
Chemical Properties of Wadsleyite
|Simplified for copy/paste:||(Mg,Fe2+)2(SiO4)|
|Essential elements:||Mg, O, Si|
|All elements listed in formula:||Fe, Mg, O, Si|
Relationship of Wadsleyite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Wadsleyite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Wadsleyite
PRICE, R.D., PUTNIS, A., AGRELL, S.O. & SMITH, D.G.W. (1983): Wadsleyite, natural bbb-(Mg,Fe)2SiO4 from the Peace River meteorite. Canadian Mineralogist 21, 29-35.
KUDOH, Y., INOUE, T. & ARASHI, H. (1996): Structure and crystal chemistry of hydrous wadsleyite Mg1.75SiH0.5O4: possible hydrous magnesium silicate in the mantle transition zone. Physics and Chemistry of Minerals 23, 461-469.
SMYTH, J.R., KAWAMOTO, T., JACOBSEN, S.D., SWOPE, R.J., HERVIG, R.L. & HOLLOWAY, J.R. (1997): Crystal structure of monoclinic hydrous wadsleyite β-(Mg,Fe)2SiO4. American Mineralogist 82, 270-275.
Sinogeikin, S.V., Katsura, T., and Bass, J.D. (1998) Sound velocities and elastic properties of Fe-bearing wadsleyite and ringwoodite. Journal of Geophysical Research: 103: 20819-20825.
Demouchy, S., Deloule, E., Frost, D.J., and Keppler, H. (2005) Pressure and temperature-dependence of water solubility in Fe-free wadsleyite. American Mineralogist: 90: 1084-1091.
Oliver Tschauner, Paul D. Asimow et al. Ultrafast growth of wadsleyite in shock-produced melts and its implications for early solar system impact processes PNAS 2009 : 0905751106v1-pnas.0905751106.
Internet Links for Wadsleyite
Localities for Wadsleyite
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Aggeneys, Namakwa District (Namaqualand), Northern Cape Province, South AfricaFrom Debbie Woolf, 17th Apr 2014 21:10:59