Micropegmatite is the dominant material that comprises granophyres, fine-grained granite porphyries that consist of irregular intergrowths of quartz and feldspar imbedded in a groundmass. However, the rock may also often be found among common granites and the fine-grained igneous rocks called diabases. Within the latter, micropegmatite is often interstitial, appearing as veins, seams, or aggregates