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Typically, plagioclase occurs as laths in the groundmass, 0.1-0.5 mm in size.
The authigenic nature of the illite is evident from its fibrous, lath- or lettuce-like habit.
Phenocrysts of plagioclase, hornblende and clinopyroxene are embedded in a very fine-grained groundmass of plagioclase laths, fine hornblende prisms, and some biotite and augite crystals.
The plagioclase laths are believed to represent relict plagioclase phenocrysts in the volcanic protolith.
Euhedral laths of zoned plagioclase define a distinct igneous lamination.
Of the fluoroapatite, a subset of crystals is lath shaped, 5-10 m in size.
However, plagioclase laths are poorly aligned and biotite is randomly oriented.
The planar fabric is defined by the preferred orientation of amphibole laths and compositional layering.
