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|Formula gives the approximate bulk composition. Later studies (Smith et al 1987) found progressive changes of the bulk composition during alteration, with final stages approaching the composition of pure goethite (FeOOH).|
A common alteration product of Olivine, often observed in thin sections.
A mixture of clay minerals (chlorite group, smectite group), iron oxides and ferrihydrides.
Classification of Iddingsite
|IMA status:||Not Approved|
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Physical Properties of Iddingsite
Optical Data of Iddingsite
|RI values:||nα = 1.670 - 1.730 nβ = 1.700 - 1.760 nγ = 1.720 - 1.770|
|Maximum Birefringence:||δ = 0.050|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Iddingsite
Formula gives the approximate bulk composition. Later studies (Smith et al 1987) found progressive changes of the bulk composition during alteration, with final stages approaching the composition of pure goethite (FeOOH).
|Essential elements:||Fe, H, Mg, O, Si|
|All elements listed in formula:||Fe, H, Mg, O, Si|
Other Names for Iddingsite
|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 Iddingsite
Sun, M. (1957) The nature of iddingsite in some basaltic rocks of New Mexico. American Mineralogist, 42, 525-533.
Eggleton, R.A. (1984) Formation of Iddingsite Rims on Olivine: A Transmission Electron Microscope Study. Clays and Clay Minerals, 32(1) 1-11.
Smith, K.L., Milnes, A.R., Eggleton, R.A. (1987) Weathering of basalt: formation of iddingsite. Clays and Clay Minerals, 35(6), 418-428.
Internet Links for Iddingsite
Localities for Iddingsite
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: Cave Hill, (David Mitchell Limestone Quarry), Lilydale, Victoria, AustraliaFrom Steve Sorrell, 18th May 2013 12:21:45