rare real yellow and gray romanchite with goethite, yellow and black mineral

abstract background black iron ore botryoidal texture close closeup diaspore gemmology gemological gemology gemstone geological geology goethite hydroxide iron isolated lichen lichen looking crystal macro macro shooting manganese manganese oxide mineral mineralogical mineralogy natural nature psilomelane rare rock romanechite rough specimen stone tree branch like uncut unpolished vibrant yellow volcano white yellow gray romanechite