background black granite red hard rock rock solid solid stone swedish granite texture eroded granite granitic lines natural nature norway striated worn abundance abundant boulder circle compete competition crowd grey lichen lots many multitude pink plant profusion round Sardinia color colour rough surface concrete pattern stonewall wall orange sveres crystals feldspar felsic floor granit igneous intrusive porphyry quartz abstract ancient appearance coarse-grained composite concentrically-layered decorative granodiorite igneous-rock orbicular-granite orbicular-rock orbicules orbiculite ornamental ornamental-rock plutonic-rock rare rocks shells spheroidal-structures surfaced surfaces textured textures uncommon unique construction igneous rock piece processed stones tough