This is a rare specimen, the first I have personally seen, of material I could only find referenced in an Arizona Bureau of Mines report. Harold Urish self-collected this in 1999 at the so-called God's Claim, here. It features unusual, acicular crystals of mimetite on a background of green mineralization which, according to that report, as summarized on MINDAT, may be descloizite or bayldonite. Ex. Harold Urish Collection.