Examples of plagioclase

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In some sections, fresh plagioclase occurs as isolated islands in a strongly sericitized matrix crystal.
These patches apparently represent remnants of primary plagioclase phenocrysts.
The groundmass consists of plagioclase, pyroxene and glass with an interstitial texture.
The absence of small plagioclases probably indicates their dissolution.
The chemical variation of the plagioclases in the tuffs is therefore most likely influenced by different degrees of alteration.
Overlying the alkali basalts are minor tephrite and plagioclase- and kaersutite-phyric phonotephrite lavas.
The plagioclase is seen either as phenocrysts or as microliths within the matrix.
These centres are thus comprised of quartz and plagioclase.
In the first stage, the garnet was partially to wholly replaced by kelyphitic coronites formed of radiating, symplectic intergrowths of orthopyroxene (hypersthene) and plagioclase.
During this stage, the mafic minerals grow faster than plagioclase, exhausting the local melt in mafic components.
There are also small quantities of generally albitic plagioclase and grains of conspicuously twinned microcline that are not visibly perthitic.
It displays different habits, ranging from phenocrysts to small grains interstitially distributed between plagioclase laths.
The clinopyroxene forms neutral to pale brown, subhedral to anhedral crystals, occasionally containing inclusions of plagioclase microlaths and opaque phases.

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