Mugearite
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About Mugearite
A volcanic rock, often exhibiting flow texture, containing small phenocrysts of olivine, augite and magnetite in a matrix of oligoclase, augite and magnetite with interstitial alkali feldspar. Now defined chemically as the sodic variety of basaltic trachyandesite where (Na2O-2)>K2O.
Usually described visually as a basaltic rock.
Usually described visually as a basaltic rock.
Classification of Mugearite
Mugearite is found in field S2 in the TAS diagram.
Sub-divisions of Mugearite
- Mugearite
Mineralogy of Mugearite
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. |
| Feldspar > Plagioclase | A petrological term for Albite-Anorthite Series. |
| Olivine | Equivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite. |
| Pyroxene > Clinopyroxene > Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Magnetite | Fe2+Fe3+2O4 |
References for Mugearite
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 Mugearite
mindat.org URL:
https://www.mindat.org/min-48462.html
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