Under European petrological standards, Vizag Blue is formally classified as a fine-grained blue-grey gneiss of the Precambrian period — a distinction that sets it apart from true igneous granites, even though it is commercially traded under the granite designation worldwide. The surface carries a mid greyish-blue ground traversed by darker grey striations, with a faint red mottle that introduces a subtle warmth against the otherwise cool tonal field. Slight variation in the grey vein pattern occurs from block to block, which is an inherent characteristic of the stone’s natural formation rather than an inconsistency in quality.