An unusual Kelly Mine piece in that it has an association preserved, whereas most never had associated minerals to begin with or the other minerals were dissolved off in the old days by cleaning these in acid. The calcite is so elegant and curvy, I mistook it (as did the previous owner) for selenite...but a selenite collector I sent it to did the test and showed it to be calcite. The crystals are complete and elegantly perched, on the stark blue contrast.