Granite from Portugal
ICodeICPTGR00701
Also known asCinzento Monchique, St. Louis.
Macroscopic descriptionMedium to coarse grained nepheline syenite with a greyish general colour from which reddish-brown grains of nepheline stand out.
Petrographic descriptionA holocrystalline, coarse grained igneous rock comprising predominantly alkali feldspars with laths of hornblende and biotite.
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