Mogánite
A valid IMA mineral species
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About Mogánite
Formula:
SiO2
Colour:
Grey
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
2.52 - 2.58
Crystal System:
Monoclinic
Name:
After the type locality: Mogán, Grand Canary Island, Spain.
Polymorph of:
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 and infrared spectroscopy.
Polymorphous (or polytypic?) with UM2000-61-SiO.
It may be identified by careful powder diffraction analysis or Raman and infrared spectroscopy.
Polymorphous (or polytypic?) with UM2000-61-SiO.
Unique Identifiers
Mindat ID:
2739
Long-form identifier:
mindat:1:1:2739:3
GUID
(UUID V4):
(UUID V4):
b0367cb0-693d-4063-a4d5-b7841624acab
IMA Classification of Mogánite
Approved
IMA Formula:
SiO2 · nH2O
First published:
1984
Classification of Mogánite
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
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
7 : Oxides and Hydroxides
8 : Oxides of Si
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Mog | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Mog | Whitney & Evans (2010) | Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371 |
| Mog | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30 |
Physical Properties of Mogánite
Vitreous
Transparency:
Translucent
Colour:
Grey
Hardness:
6 on Mohs scale
Density:
2.52 - 2.58 g/cm3 (Measured) 2.55 g/cm3 (Calculated)
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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
not discernible
Chemistry of Mogánite
Mindat Formula:
SiO2
Elements listed:
Crystallography of Mogánite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.758 Å, b = 4.876 Å, c = 10.715 Å
β = 90.08°
β = 90.08°
Ratio:
a:b:c = 1.796 : 1 : 2.197
Unit Cell V:
457.573 ų
Z:
12
Comment:
Space group is I2/a (Miehe & Graetsch, 1992; Heaney & Post, 2001); the unit cell parameters are from the first reference cited; at ~297 oC transforms into Imab-structured (orthorhombic) phase (Heaney & Post, 2001))
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.33 Å | (100) |
| 3.39 Å | (50) |
| 4.45 Å | (13) |
| 1.81 Å | (13) |
| 1.369 Å | (11) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 9 : Lava/xenolith minerals (hornfels, sanidinite facies) | |
| Stage 4a: Earth’s earliest continental crust | >4.4-3.0 |
| 20 : Acidic volcanic rocks |
Type Occurrence of Mogánite
General Appearance of Type Material:
Nodular masses 1-5 cm in diameter. Also as platy masses 1-10 mm in thickness in cooling cracks.
Geological Setting of Type Material:
Rhyolitic ignimbrites.
Associated Minerals at Type Locality:
Reference:
Flörke, O.W., Flörke, U., Giese, U. (1984) Moganite, a new microcrystalline silica-mineral. Neues Jahrbuch für Mineralogie, Abhandlungen: 149: 325-336.
Synonyms of Mogánite
Other Language Names for Mogánite
Common Associates
Associated Minerals Based on Photo Data:
| 48 photos of Mogánite associated with Chalcedony | SiO2 |
| 14 photos of Mogánite associated with Quartz | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 4.DA. | Chibaite | SiO2 · n(CH4, C2H6, C3H8, i-C4H10) (n = 3/17 (max)) |
| 4.DA. | Carbon Dioxide Ice | CO2 |
| 4.DA. | Bosoite | SiO2 · nCxH2x+2 |
| 4.DA.05 | Quartz | SiO2 |
| 4.DA.10 | Opal | SiO2 · nH2O |
| 4.DA.10 | Tridymite | SiO2 |
| 4.DA.15 | Cristobalite | SiO2 |
| 4.DA.25 | Melanophlogite | 46SiO2 · 6(N2,CO2) · 2(CH4,N2) |
| 4.DA.30 | Lechatelierite | SiO2 |
| 4.DA.35 | Coesite | SiO2 |
| 4.DA.40 | Stishovite | SiO2 |
| 4.DA.45 | Keatite | SiO2 |
| 4.DA.50 | Seifertite | SiO2 |
| 4.DA.55 | Quartz-beta | SiO2 |
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.
Internet Links for Mogánite
mindat.org URL:
https://www.mindat.org/min-2739.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Mogánite
Reference List:
Jambor, John L., Grew, Edward S., Roberts, Andrew C. (1996) New mineral names. American Mineralogist, 81. 1513-1518
Localities for Mogánite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Antarctica | |
| Sorrell (n.d.) |
Australia | |
| Fetherston et al. (2012) |
Austria | |
| Mineralienatlas.de +1 other reference |
| Götzinger | |
Brazil | |
| Vanrusselt (2023) |
| Personal knowledge from years of ... |
Bulgaria | |
| Janakieva +3 other references | |
| Janakieva +3 other references | |
| Janakieva +3 other references |
Canada | |
| Grand Manan Museum |
China | |
| Zhou et al. (2022) |
| Zhang +2 other references |
Czech Republic | |
| Koníčková Š. et al. (2016) |
Egypt | |
| Hassan (2014) |
Finland | |
| Valkama (2019) |
| Jouni Laurinperä photo and collection ( photo id 965669 + 965670 ) | |
France | |
| G. Demarcq |
| |
| F. Roulin et al. |
Germany | |
| https://www.mineralienatlas.de/?l=53526 |
| T. Witzke et al.: Lapis 2001 (12) |
Greece | |
| Bourli et al. (2021) |
| Bourli et al. (2021) | |
| Bourli et al. (2021) | |
| Bourli et al. (2021) |
Hungary | |
| |
| GEODA |
India | |
| Eur. Jour. Min. 13 (2001) |
Indonesia | |
| - (n.d.) |
Italy | |
| Napoleoni et al. (2021) +1 other reference |
Japan | |
| Confirmed by Dr D. Nishio-Hamane using ... |
| Matsubara and Miyawaki (2006) |
Luxembourg | |
| www.mnhn.lu (n.d.) |
Myanmar | |
| Aung et al. (2021) |
Netherlands | |
| T.G. Nijland | |
New Zealand | |
| Mineralogical Magazine +4 other references |
Norway | |
| Kvamsdal (1999) |
Poland | |
| Ł. Kruszewski EPMA/PXRD data +1 other reference |
| Ł. Kruszewski PXRD data |
Romania | |
| Udubaªa et al. (2006) |
| minerals-of-the-carpathians.eu (2008) |
| Hîrtopanu (1997) +1 other reference |
| Udubaªa et al. (2006) |
Russia | |
| Svetova et al. (2023) |
| Sidorov A.A. Mineralogy of Vodinskoe ... |
Slovakia | |
| Ďuďa (1993) |
| Koděra (1986) |
| Koděra (1986) | |
| Koděra (1986) |
| Koděra (1986) | |
| Koděra (1986) |
Spain (TL) | |
| American Mineralogist et al. (1985) |
| Calvo Rebollar (2016) +1 other reference | |
| American Mineralogist (1993) |
| Herrero +4 other references | |
UK | |
| Ford et al. (1993) |
| Render (n.d.) |
| ... |
Ukraine | |
| Klimchouk (2012) |
USA | |
| Natkaniec-Nowak et al. (2020) |
| www.mindat.org (n.d.) |
| Eckel et al. (1997) |
| Rocks & Minerals (July-August, 2002) |
| Eckel et al. (1997) | |
| Volkert et al. (2023) |
| Volkert et al. (2023) |
| Ward's Natural Science Establishment (Rochester, NY) |
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Kodono, Kamiukena District, Ehime Prefecture, Japan