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Iddingsite
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Playa de Candelaria, Candelaria, Tenerife, Santa Cruz de Tenerife Province, Canary Islands, Spain
© Martins da Pedra
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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). | ||||||||||||||||||||
| Hardness: | 3 | |||||||||||||||||||
| Name: | Named by Andrew Cowper Lawson in 1893 for one of the great American petrologists Joseph Paxson Iddings [January 21, 1857 Baltimore, Maryland - September 8, 1920]. He was with the United States Geological Survey and later professor at the University of Chicago. He was one of the great petrologists of his era. | |||||||||||||||||||
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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| mindat.org URL: | http://www.mindat.org/min-7006.html Please feel free to link to this page. | |||||||||||||||||
Physical Properties of Iddingsite | ||||||||||||||||||
| Hardness (Mohs): | 3 | |||||||||||||||||
Optical Data of Iddingsite | ||||||||||||||||||
| Type: | Biaxial (-) | |||||||||||||||||
| 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. | |||||||||||||||||
| Surface Relief: | High | |||||||||||||||||
| Dispersion: | relatively strong | |||||||||||||||||
Chemical Properties of Iddingsite | ||||||||||||||||||
| Formula: |
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 | ||||||||||||||||||
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Other Information | ||||||||||||||||||
| 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 | ||||||||||||||||||
| Reference List: - + | 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 | ||||||||||||||||||
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Localities for Iddingsite | ||||||||||||||||||
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(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


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