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Mugearite

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About MugeariteHide

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.


Classification of MugeariteHide

TAS_S2.png

Mugearite is found in field S2 in the TAS diagram.

Sub-divisions of MugeariteHide

Mineralogy of MugeariteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparA subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
OlivineEquivalent 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:
MagnetiteFe2+Fe3+2O4

References for MugeariteHide

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

Internet Links for MugeariteHide

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https://www.mindat.org/min-48462.html
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