If a rock undergoes phyllic alteration, then orthoclase feldspar, biotite and various silicates are altered in addition to plagioclase.
en.wikipedia.org For example, the biotite series is represented by variable amounts of the endmembers phlogopite, siderophyllite, annite, and eastonite.
en.wikipedia.org Quartz crystals make up 25%, plagioclase 5%, alkali feldspar 10%, biotite 5-10% which is altered to chlorite, epidote and leucoxene.
en.wikipedia.org Although the compositional range of the monzogranites is small, it defines a differentiation trend that is essentially controlled by biotite and plagioclase fractionation.
en.wikipedia.org They consist of labradorite and olivine phenocrysts in a groundmass of plagtoclase, augite, and biotite.
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