Peralkaline phonolite
A rock subtype
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A term that has been defined in two related ways:
1. for a variety of phonolite of QAPF field 11 that contains alkali pyroxene and/or alkali amphibole.
2. for a variety of phonolite of TAS classification field Ph that has a peralkaline index > 1.
1. for a variety of phonolite of QAPF field 11 that contains alkali pyroxene and/or alkali amphibole.
2. for a variety of phonolite of TAS classification field Ph that has a peralkaline index > 1.
Unique Identifiers
Mindat ID:
50307
Long-form identifier:
mindat:1:1:50307:1
GUID
(UUID V4):
(UUID V4):
25ccca70-17d9-4b5e-9531-8d8535960d47
Classification of Peralkaline phonolite
Peralkaline phonolite appears in field 11 in the QAPF diagram.^TAS
Sub-divisions of Peralkaline phonolite
- Peralkaline phonolite
Mineralogy of Peralkaline phonolite
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspar > Alkali Feldspar | A subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium. |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Alkali amphibole | A petrological term for alkali rich amphiboles. |
| Alkali pyroxene | A petrological name for the sodium-rich pyroxenes aegirine and aegirine-augite. |
References for Peralkaline phonolite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press
Internet Links for Peralkaline phonolite
mindat.org URL:
https://www.mindat.org/min-50307.html
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