septarian concretion with crystals of calcite, barite and ammonite sink in center. natural mineral with star-d

mineral septarian ammonite purple blue fantasy mystery stains sink precious smooth shiny gem grunge gemstone crystals jewelry glitter silica calcite futuristic textured art abstract psychedelic rough design mining semiprecious pattern texture material bright nature surface rock geology natural closeup stone ammonoidea barite concretion lamellar