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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.
Classification of FeniteHide
Mineralogy of FeniteHide
Essential minerals - these are minerals that are required within the classification of this rock:
|Alkali pyroxene||A petrological name for the sodium-rich pyroxenes aegirine and aegirine-augite.|
|Feldspar > Alkali Feldspar||A subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.|
|Sodic amphibole||A petrological term for amphibole rich in sodium.|
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
References for FeniteHide
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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.