A quarry is where a fine-grained, foliated, homogeneous metamorphic rock has been excavated.
A quarry is a place from which dimension stone , rock , construction aggregate , riprap , sand , gravel , or slate has been excavated from the ground .	dimension stone	dimension stone	rock	rock (geology)	construction aggregate	construction aggregate	riprap	riprap	sand	sand	gravel	gravel	slate	slate
Slate is a fine-grained , foliated , homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism .	foliated	foliation (geology)	metamorphic rock	metamorphic rock	shale	shale	sedimentary rock	sedimentary rock	clay	clay	volcanic	volcano	ash	ash (volcanic)	metamorphism	metamorphism
