porphyroclastic
/ˌpɔːfɪrə(ʊ)ˈklastɪk/Geology
adjective
Of a rock or its texture: marked by the presence of porphyroclasts.
Origin
1920s; earliest use found in Arthur Holmes (1890–1965), geologist and geophysicist. From porphyro- + clastic, after German porphyroklastisch.