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Anorthosite

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About AnorthositeHide

A coarse-grained crystalline rock consisting mostly of calcic plagioclase (>90%, usually labradorite) with <10% mafics. The mafic mineral may be clinopyroxene, orthopyroxene, olivine, or, more rarely, amphibole. Oxides, mostly magnetite or ilmenite, are also common.


Classification of AnorthositeHide

QAPF_P_10.png

Anorthosite is in section 10 of the QAPF diagram.

Sub-divisions of AnorthositeHide

Mineralogy of AnorthositeHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
PyroxeneA petrological term for Pyroxene Group.

Synonyms of AnorthositeHide

Internet Links for AnorthositeHide

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https://www.mindat.org/min-48323.html
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