One of the mysteries of the English language finally explained.
A larger recrystallized grain occurring in a finer groundmass in a metamorphic rock.
- ‘Such inclusions may be aligned, preserving evidence of the fabric in the rock when the porphyroblast grew.’
- ‘Cordierite in these two metamorphic belts forms rounded, opaque black to brown porphyroblasts typically less than 0.5 inch across.’
- ‘Evidence of contact metamorphism of the wall-rock includes andalusite porphyroblasts enclosed in a fabric related to Caledonian nappe emplacement.’
- ‘The foliation in the lowest unit is locally overgrown by porphyroblasts of andalusite (now commonly altered to finegrained phyllosilicates) and by biotite.’
- ‘In contrast, 2 km to the NE on the southern side of the Dharlang Nala, there are kyanite grade assemblages with a weaker foliation, flattened symmetrically around garnet porphyroblasts.’
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