Given that your geology "expert" hasn't earned a dime from swinging a rock hammer at mineralized outcrops since 1983, you are fortunate to have encountered one of the easy ones for this aging prospector to comment on. The nearly ghost town of Cleator, AZ lies at the northern end of the Black Canyon Mining District, host of many small mines and prospects opened to produce copper, lead, zinc, gold, and silver. Host rocks are Precambrian mica shists, an intermediate grade metamorphic rock and frequently the host of metallic ore deposits in Arizona and worldwide. The bright green is of course indicative of copper mineralization which is almost always found near the surface since oxides and carbonates of copper are the weathering products of the original copper sulfide mineral chalcopyrite. As its name suggests, chalcopyrite is a form of pyrite (fool's gold) containing copper in addition to iron. Who knows how many mineral deposits in AZ and other areas were initially found by prospectors out "huntin' color" since brightly colored oxides and carbonates are almost always connected to unweathered primary orebodies. The pictured rock looks like it has copper mineralization as thin sheets within the schist rock, perhaps indicative of having been broken out of wall rock away from the primary sulfides in a zone with only thin stringers and sheets of sulfides rather than massive, thick agglomerations of sulfide ore minerals.