Phengite: Difference between revisions
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'''Phengite''' is a series name for dioctahedral [[mica]]s of composition K(AlMg)<sub>2</sub>(OH)<sub>2</sub>(SiAl)<sub>4</sub>O<sub>10</sub> it is common for Mg or Fe2+ to substitute for Al on the Y site and a corresponding increase in Si on the Z site in the mica group formula ''X''<sub>2</sub>''Y''<sub>4–6</sub>''Z''<sub>8</sub>[[Oxygen|O]]<sub>20</sub>([[Hydroxyl|OH]], [[Fluoride|F]])<sub>4</sub>. |
'''Phengite''' is a series name for dioctahedral [[mica]]s of composition K(AlMg)<sub>2</sub>(OH)<sub>2</sub>(SiAl)<sub>4</sub>O<sub>10</sub> it is common for Mg or Fe2+ to substitute for Al on the Y site and a corresponding increase in Si on the Z site in the mica group formula ''X''<sub>2</sub>''Y''<sub>4–6</sub>''Z''<sub>8</sub>[[Oxygen|O]]<sub>20</sub>([[Hydroxyl|OH]], [[Fluoride|F]])<sub>4</sub>. Similar to [[muscovite]] but with addition of [[magnesium]]. It is a non-[[International Mineralogical Association|IMA]] recognized mineral name representing the series between muscovite and [[celadonite]].<ref>[http://www.mindat.org/min-3189.html Mindat.org] </ref><ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Phengit Mineralienatlas: Phengit] </ref> |
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The silica content of phengite has been proposed as a [[Geothermobarometry|geobarometer]] for the [[metamorphism]] of low grade [[schist]]s.<ref> M. E. Fleet and R. A. Howie, ''Rock-Forming Minerals, Vol. 3A: Micas'', Geological Society of London; 2nd ed, 2006, p. 132, {{ISBN|1-86239-142-4}} (accessed through Google books)</ref> |
The silica content of phengite has been proposed as a [[Geothermobarometry|geobarometer]] for the [[metamorphism]] of low grade [[schist]]s.<ref> M. E. Fleet and R. A. Howie, ''Rock-Forming Minerals, Vol. 3A: Micas'', Geological Society of London; 2nd ed, 2006, p. 132, {{ISBN|1-86239-142-4}} (accessed through Google books)</ref> |
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Revision as of 15:19, 9 April 2019
| Phengite | |
|---|---|
 | |
| General | |
| Category | Mica group |
| Formula (repeating unit) | K(AlMg)2(OH)2(SiAl)4O10 |
Phengite is a series name for dioctahedral micas of composition K(AlMg)2(OH)2(SiAl)4O10 it is common for Mg or Fe2+ to substitute for Al on the Y site and a corresponding increase in Si on the Z site in the mica group formula X2Y4–6Z8O20(OH, F)4. Similar to muscovite but with addition of magnesium. It is a non-IMA recognized mineral name representing the series between muscovite and celadonite.[1][2]
The silica content of phengite has been proposed as a geobarometer for the metamorphism of low grade schists.[3]
References
- ^ Mindat.org
- ^ Mineralienatlas: Phengit
- ^ M. E. Fleet and R. A. Howie, Rock-Forming Minerals, Vol. 3A: Micas, Geological Society of London; 2nd ed, 2006, p. 132, ISBN 1-86239-142-4 (accessed through Google books)
- Glossary of Geology, Fifth Edition, Eds. K.K.E. Neiendorf, J.P. Mehl, J.A. Jackson, American Geological Institute, 2005
- von Kobell, Franz (1853) Tafeln zur Bestimmung des Mineralien, 5th edition, Munchen.
- Guidotti, Charles V. (1984) Micas in metamorphic Rocks, reviews in Mineralogy, 13: 357-467.
- Rieder et al. (1998): Nomenclature of the micas. Canadian Mineralogist 36: 905-912.
- Mookherjee, M., and Redfern, S.A.T. (2002) A high-pressure Fourier-transform infrared study of the interlayer and Si-O stretching region in phengite-2M 1. Clay Minerals: 37: 323-336.
- Cibin, G., G. Cinque, A. Marcelli, A. Mottana, & R. Sassi (2008): The octahedral sheet of metamorphic 2M1-phengites: a combined EMPA and AXANES study: American Mineralogist 93, 414-425.
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