Slate (writing) expensive. Slate (writing) A slate is a thin piece of hard flat material, such as the rock also called slate, that is used as a medium for writing. The rock is “a metamorphic rock created by the recrystallization of the minerals in shale from clay to parallel-aligned, flat, flake-like minerals such as mica”. The writing slate consisted of a piece of slate, typically either 4x6 inches or 7x10 inches, encased in a wooden frame. A precise date range for writing slates of this type has not been established. Usually, a piece of cloth or slate sponge was used to clean
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"