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|Name:||After the type locality: Mogán, Grand Canary Island, Spain.|
This SiO2 modification is not uncommon as a minor component of finely crystalline chalcedony (as well as chert or flint), although some samples may contain up to about 50 vol.% of moganite.
It may be identified by careful powder diffraction analysis or Raman spectroscopy.
Classification of Mogánite
|Nickel-Strunz 10th (pending) edition ID:||4.DA.20|
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
A : With small cations: Silica family
|Hey's CIM Ref.:||7.8.9|
7 : Oxides and Hydroxides
8 : Oxides of Si
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Type Occurrence of Mogánite
|Type Locality:||Mogán, Gran Canaria (Grand Canary), Las Palmas Province, Canary Islands, Spain|
|Year of Discovery:||1984|
Physical Properties of Mogánite
|Density (calculated):||2.55 g/cm3|
Crystallography of Mogánite
|Cell Parameters:||a = 8.75Å, b = 4.87Å, c = 10.71Å|
β = 90.09°
|Ratio:||a:b:c = 1.797 : 1 : 2.199|
|Unit Cell Volume:||V 456.38 Å³ (Calculated from Unit Cell)|
Optical Data of Mogánite
|RI values:||nα = 1.524 nγ = 1.531|
|Maximum Birefringence:||δ = 0.007|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Mogánite
|Simplified for copy/paste:||SiO2|
|Essential elements:||O, Si|
|All elements listed in formula:||O, Si|
Relationship of Mogánite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Mogánite
|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 Mogánite
Neues Jahrbuch für Mineralogie, Abhandlungen (1984): 149: 325-336.
American Mineralogist (1985): 70: 874.
American Mineralogist (1993): 78: 677.
Kingma, K. J. & Hemley, R. J. (1994): Raman spectroscopic study of microcrystalline silica. Am. Mineral. 79, 269-273.
Götze, J., Nasdala, L., Kleeberg, R. & Wenzel, M. (1998): Occurrence and distribution of " moganite " in agate/chalcedony: a combined micro-Raman, Rietveld, and cathodoluminescence study. Contributions to Mineralogy and Petrology 133, 96-105.
Parthasarathy, G., Kunwar, A. C. & Srinivasan, R. (2001): Occurrence of moganite-rich chalcedony in Deccan flood basalts, Killari, Maharashtra, India. European Journal of Mineralogy 13, 127-134.
Rodgers, K. A. & Cressey, G. (2001): The occurrence, detection and significance of moganite (SiO2) among some silica sinters. Mineralogical Magazine 65, 157-167.
Moxon, T. & Rios, S. (2004): Moganite and water content as a function of age in agate: an XRD and thermogravimetric study. European Journal of Mineralogy 16, 269-278.
Patrick Schmidt, Ludovic Bellot-Gurlet, Aneta Slodczyk, François Fröhlich (2012): A hitherto unrecognised band in the Raman spectra of silica rocks: influence of hydroxylated Si–O bonds (silanole) on the Raman moganite band in chalcedony and flint (SiO2). Physics and Chemistry of Minerals 39, 455-464.
Internet Links for Mogánite
Localities for Mogánite
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: Estremoz, Évora District, PortugalFrom Rui Nunes, 24th Apr 2014 10:36:34