SLATE, a pioneer organization of the New Left and precursor of the Free Speech Movement and formative  counterculture era, was a campus political party at the University of California, Berkeley from 1958 to 1966.

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. It is the finest grained foliated metamorphic rock. Foliation may not correspond to the original sedimentary layering, but instead is in planes perpendicular to the direction of metamorphic compression.