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Virtually unaltered amphibolites may have subordinate, late, randomly oriented biotite laths overgrowing the main foliation.
It displays different habits, ranging from phenocrysts to small grains interstitially distributed between plagioclase laths.
They investigated apparent dihedral angle populations generated by randomly oriented grains of differing shape, ranging from spheres to cubes and laths.
Lath-shaped plagioclase is albite in composition and pyroxene has been mainly replaced by tremolite.
Occasionally the pyroxene occurs also as poikilitic plates (3-5 mm) enclosing plagioclase laths.
The planar fabric is defined by the preferred orientation of amphibole laths and compositional layering.
However, plagioclase laths are poorly aligned and biotite is randomly oriented.
Of the fluoroapatite, a subset of crystals is lath shaped, 5-10 m in size.
