Serpentine

A metamorphic rock which takes a polish, typically dark to yellowish green, sometimes brown, and often with spots or mottling; its snake-like qualities. It is often considered a marble. During the Renaissance green Greek porphyry was described as antique serpentine. "Serpentine" can also refer to other reptilian attributes, as in a curvatious or meandering form.(SER-pən-teen)