schistose
131porphyroid — ˈpȯ(r)fəˌrȯid noun ( s) Etymology: porphyry + oid : a more or less schistose metamorphic igneous or sedimentary rock with porphyritic texture …
132quartz schist — noun : a metamorphosed schistose rock composed essentially of quartz often with some mica or tourmaline or both …