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Mogánite

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Formula:
SiO2
System:
Monoclinic
Colour:
Grey
Hardness:
6
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

Approved
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
7.8.9

7 : Oxides and Hydroxides
8 : Oxides of Si
mindat.org URL:
http://www.mindat.org/min-2739.html
Please feel free to link to this page.

First Recorded Occurrence of Mogánite

Year of Discovery:
1984

Physical Properties of Mogánite

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
Grey
Hardness (Mohs):
6
Density:
2.55 g/cm3 (Calculated)

Crystallography of Mogánite

Crystal System:
Monoclinic
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 ų (Calculated from Unit Cell)

Optical Data of Mogánite

Type:
Biaxial
RI values:
nα = 1.524 nγ = 1.531
Max Birefringence:
δ = 0.007
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
not discernible

Chemical Properties of Mogánite

Formula:
SiO2
Essential elements:
All elements listed in formula:

Relationship of Mogánite to other Species

4.DA.05QuartzSiO2
4.DA.10OpalSiO2 · nH2O
4.DA.10TridymiteSiO2
4.DA.15CristobaliteSiO2
4.DA.25Melanophlogite46SiO2 · 6(N2,CO2) · 2(CH4,N2)
4.DA.30LechatelieriteSiO2
4.DA.35CoesiteSiO2
4.DA.40StishoviteSiO2
4.DA.45KeatiteSiO2
4.DA.50SeifertiteSiO2
7.8.1QuartzSiO2
7.8.2CoesiteSiO2
7.8.3TridymiteSiO2
7.8.4StishoviteSiO2
7.8.5CristobaliteSiO2
7.8.6LechatelieriteSiO2
7.8.7Silhydrite3SiO2 · H2O
7.8.8OpalSiO2 · nH2O

Other Names for Mogánite

Name in Other Languages:

Other Information

Health Risks:
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

Reference List:
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.

Zhang, M., Moxon, T. (2014): Infrared absorption spectroscopy of SiO2-moganite. American Mineralogist 99, 671-680.

Internet Links for Mogánite

Localities for Mogánite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Australia
 
  • Western Australia
    • Meekatharra Shire
      • Sylvania Station
Fetherston, J., Stocklmayer, S., Stocklmayer, V. (2013): Gemstones of WA, Geological Survey of WA
Brazil
 
  • Goiás
    • Catalão II Carbonatite Complex
      • Catalão
Vik Vanrusselt Collection
  • Rio Grande do Sul
Personal knowledge from years of dealing with the geodes from this locality [Rock Currier 2011]
Bulgaria
 
Janakieva, Zh., Ch. Nachev, D. Yordanova. Finds of Moganite in Bulgaria.Poster.ІІІ International Symposium “Mineral diversity -Research and preservation” 7-10 October, 2005, Sofia.
Janakieva, Zh., Ch. Nachev, D. Yordanova. Finds of Moganite in Bulgaria.Poster.ІІІ International Symposium “Mineral diversity -Research and preservation” 7-10 October, 2005, Sofia.
  • Varna Oblast
Janakieva, Zh., Ch. Nachev, D. Yordanova. Finds of Moganite in Bulgaria.Poster.ІІІ International Symposium “Mineral diversity -Research and preservation” 7-10 October, 2005, Sofia.
France
 
  • Ile-de-France
    • Paris
  • Provence-Alpes-Côte d'Azur
    • Vaucluse
      • Apt
F. Roulin et al. , 1986, 109, pp. 349-357.
  • Rhône-Alpes
    • Loire
      • Saint-Etienne
        • Saint-Priest-en-Jarez
G. Demarcq, 1973, "Guides Géologiques Régionaux : Lyonnais, Vallée du Rhône" , p. 88, Masson.
Germany
 
  • Thuringia
    • Vogtland
      • Hirschberg
        • Ullersreuth
T. Witzke et al.: Lapis 2001(12), 13-27
Hungary
 
  • Heves Co.
    • Mátra Mts
GEODA, 2000
  • Pest Co.
    • Budai Mts
      • Budapest
India
 
  • Maharashtra
    • Latur District
Eur. Jour. Min. 13, no. 1(2001)
Japan
 
  • Honshu Island
    • Chubu Region
      • Niigata Prefecture
        • Aga-machi (Higashi-Kanbara-gun)
Matsubara and Miyawaki (2006) Catalogue of Japanese Minerals. (Tokai University Press)
Luxembourg
 
  • Diekirch District
    • Wincrange
http://www.mnhn.lu/recherche/ferrantia/publications/Ferrantia49.pdf
Netherlands
 
T.G. Nijland, J.C. Zwaan, D. Visser, J. Leloux - De mineralen van Nederland - 2007
New Zealand
MinMag 65:157-167
  • North Island
    • Northland
Mineralogical Magazine; February 2004; v. 68; no. 1; p. 191-198
Norway
 
  • Oslo
    • Grorud
Kvamsdal, L. O. (1999): Mineralene fra Huken pukkverk i Oslo. STEIN 26 (4), 14-47
Romania
 
  • Mehedinti Co.
Udubaªa, S. S., Constantinescu, S., Popescu-pogrion, N., Grecu, N. M. & Udubaªa, G. (2006) Mössbauer (ngr), Xrd, Tem/saed And Esr Investigations On Some Sulphides From Costeªti, Valea Lui Stan And Jidoªtiþa Gold Ores (southern Carpathians, Romania). Acta Miner.-Petrograph.,Abstract Series 5, Szeged, p.123
  • Suceava Co.
    • Suceava district
      • Iacobeni (Jakobeny; Jacobeny; Jakabfalva)
http://minerals-of-the-carpathians.eu
  • Vâlcea Co.
Udubaªa, S. S., Constantinescu, S., Popescu-pogrion, N., Grecu, N. M. & Udubaªa, G. (2006) Mössbauer (ngr), Xrd, Tem/saed And Esr Investigations On Some Sulphides From Costeªti, Valea Lui Stan And Jidoªtiþa Gold Ores (southern Carpathians, Romania). Acta Miner.-Petrograph.,Abstract Series 5, Szeged, p.123
Slovakia
 
  • Banská Bystrica Region
    • Žiar nad Hronom Co.
Ďuďa R., 1993 : Die mineralien der Gold und Silber - lagersttäte von Kremnitz ( Kremnica) in der Slowakei. Mineralien Welt /Haltern,Nemecko/,5, s. 20 - 32
  • Košice Region
    • Košice Co.
Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    • Trebišov Co.
Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590
  • Žilina Region
    • Turčianske Teplice Co.
Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
Spain
 
  • Canary Islands
    • Las Palmas Province
      • Gran Canaria (Grand Canary)
American Mineralogist, volume 070, pp. 874(1985)
          • Playa de Mogán
American Mineralogist (1993): 78: 677.
UK
 
  • England
    • Derbyshire
      • Ashford-in-the-Water
Ford, T., A. Sarjeant & M. Smith (1993): The minerals of the Peak district of Derbyshire. UK Jour. Mines & Minerals 13, 16-55.
    • Dorset
www.soton.ac.uk/~imw/Purbeck-evaporites.htm.
      • Worbarrow Bay
Paul Render
Ukraine
 
  • Ternopil' Oblast'
    • Borschiv Raion
Klimchouk, A. (2012). Gypsum karst in the Western Ukraine. International Journal of Speleology, 25(3), 20.
USA
 
  • California
    • Los Angeles Co.
      • Santa Monica Mts
        • Agoura Hills
http://www.mindat.org/article.php/2067/Three+new+melanophlogite+pseudomorph+localities+from+Santa+Monica+Mts%2C+So.Calif.
  • Colorado
    • Rio Blanco Co.
Minerals of Colorado (1997) E.B. Eckels
    • Saguache Co.
Rocks & Minerals (July-August, 2002)
Minerals of Colorado (1997) E.B. Eckels
  • Pennsylvania
    • Adams Co.
Ward's Natural Science Establishment (Rochester, NY) specimen
Mineral and/or Locality  
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