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Mogánite

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Formula:
SiO
 
2
System:MonoclinicColour: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

IMA status:Approved
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

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

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
Maximum Birefringence:δ = 0.007

Chart 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:
SiO
 
2
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):

- +
4.DA.05Quartz
SiO
 
2
4.DA.10Opal
SiO
 
2
· nH
 
2
O
4.DA.10Tridymite
SiO
 
2
4.DA.15Cristobalite
SiO
 
2
4.DA.25Melanophlogite
46SiO
 
2
· 6(N
 
2
,CO
 
2
) · 2(CH
 
4
,N
 
2
)
4.DA.30Lechatelierite
SiO
 
2
4.DA.35Coesite
SiO
 
2
4.DA.40Stishovite
SiO
 
2
4.DA.45Keatite
SiO
 
2
4.DA.50Seifertite
SiO
 
2
Related Minerals - Hey's Index Grouping:

- +
7.8.1Quartz
SiO
 
2
7.8.2Coesite
SiO
 
2
7.8.3Tridymite
SiO
 
2
7.8.4Stishovite
SiO
 
2
7.8.5Cristobalite
SiO
 
2
7.8.6Lechatelierite
SiO
 
2
7.8.7Silhydrite
3SiO
 
2
· H
 
2
O
7.8.8Opal
SiO
 
2
· nH
 
2
O

Other Names for Mogánite

Synonyms:
IMA1999-035Lutecite
Other Languages:
German:Lutecit
Moganit
Russian:Моганит
Spanish:Lutecita
Moganita

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 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

Search Engines:
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  • External Links:
  • Look for Mogánite on Webmineral
  • Look for Mogánite on Athena Mineralogy
  • Look for Mogánite on Wikipedia
  • Look for Mogánite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
  • Mogánite specimens for sale - minfind.com
  • Buy fine minerals and gemstones from Pala International
  • rare and unusual minerals mainly crystallized
  • Fabre Minerals - search for Mogánite specimens
  • Wilensky Fine Minerals
  • Find Mogánite on www.crystalclassics.co.uk
  • Buy rare minerals from Excalibur Minerals
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  • 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.
    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 Mtns
    GEODA, 2000
    • Pest Co.
      • Budai Mtns
        • 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
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