The granularity and richness in diopside of the glacial cobble shown above (photos DPS9a and DPS9b) is most evident under SW ultraviolet light, as seen here. The thin, nonfluorescent border on the upper left of each half of the cobble is calcite marble.
Identifier: DPS9c Locality: A sand and gravel pit in the Franklin-Ogdensburg area of Sussex County. Specimen size: 12 x 9 x 8 cm Photo credit: Earl R. Verbeek
