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Fenite

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A high-temperature metasomatic rock characterised by the presence of alkali feldspar, sodic amphibole and sodic pyroxene. Nepheline, calcite and biotite/phlogopite may also be present and typical accessories are titanite and apatite. Fenites occur as zoned aureoles around alkaline igneous complexes, including carbonatites, forming in a wide range of host lithologies. They occur on the metre to kilometre scale.


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Classification of FeniteHide

Mineralogy of FeniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Alkali pyroxeneA petrological name for the sodium-rich pyroxenes aegirine and aegirine-augite.
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Sodic amphiboleA petrological term for amphibole rich in sodium.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Apatite"Apatite" is a field term for unidentified calcium phosphate members of the apatite group.
CalciteCaCO3
Feldspathoid > NephelineNa3K(Al4Si4O16)
Mica > BiotiteA series or subgroup of the Mica Group.
Mica > PhlogopiteKMg3(AlSi3O10)(OH)2
TitaniteCaTi(SiO4)O

References for FeniteHide

Reference List:
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Fettes (et al.), Metamorphic Rocks - A Classification and Glossary of Terms (2007) Cambridge University Press
Elliott, H.A.L., Wall, F., Chakhmouradian, A.R., Siegfried, P.R., Dahlgren, S., Weatherley, S., Finch, A.A., Marks, M.A.W., Dowman, E. and Deady, E. (2018): Fenites associated with carbonatite complexes: A review. Ore Geology Reviews 93, 38-59.

Internet Links for FeniteHide

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