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. 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. The foliation in slate is called "slaty cleavage". It is caused by strong compression causing fine grained clay flakes to regrow in planes perpendicular to the compression. When expertly "cut" by striking parallel to the foliation, with a specialized tool in the quarry, many slates
Rock (manga) is often presented as a considerably more complex antagonist than many of Tezuka's other villains (who are usually bad people simply because that's what they've always been and always will be), and his actions are sometimes explained by a rough past (in the manga Nextworld, "Metropolis" and the newest "Astro Boy" series, for example). Rock often appears as either a heroic major or protagonist character, such as in "Adventures of Rock" and "Princess Knight" TV Series (as Prince Frank, Sapphire's love interest), or as an antagonist whose brutal means often have justified motives through the storyline (such as in "Phoenix"