Red-fluorescent calcite, brown serpentine, small sheets of native copper, plus a 1.5-cm colorless glassy grain, probably barylite, enveloped in serpentine. Grain has good cleavage. This is the classic barylite assemblage, but specimens are few. If Princeton possesses an old iron-arc spark machine, used by early collectors as a source of UV light to show their fluorescent minerals, try it on this one. Barylite under the iron arc spark shows a fairly bright blue fluorescence. Under modern UV lamps it shows little or no response. Barylite is one of the rarest of the local minerals and has an interesting composition; it is a barium-beryllium silicate.