I initially had mis-described this as Dyscrasite on Arsenic but its more complicated than that, according to Dr. Frank Keutsch: I am pretty sure of the re-ID as I have a bunch of these pieces in my collection and am a little obsessive about analyzing them. In essence my experience always has been the sequence: dyscrasite core, followed by arsenic, with lollingite xx on top. The label also states "dyscrasite in nat. arsenic." From the important Samson Mine, then, this is a sparkling specimen of minute Lollingite crystals perched upon native arsenic atop of nodular dyscrasite (aesthetic at least by standards of that species, from here). A significant and interesting locality piece.