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Ambonite

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A local collective name for a series of andesites and dacites containing cordierite possibly formed by assimilation of sillimanite-cordierite gneiss.


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Classification of AmboniteHide

Dacite appears in fields 4 and 5 in the QAPF diagram, and andesite appears in fields 9 and 10.

Dacite is found in field 'O3' in the TAS diagram and andesite in field 'O2'.

Mineralogy of AmboniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Cordierite(Mg,Fe)2Al3(AlSi5O18)
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:

References for AmboniteHide

Reference List:
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Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press

Internet Links for AmboniteHide

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