Two halves of a stream-rounded cobble consisting mostly of diopside with a little calcite. The adhering bits of sand show it was collected not from a modern stream bed, but from one of the sand-and-gravel pits that exploit the local glacial outwash deposits, where rainwater descending through the permeable sediments gradually deposits films of calcite that cement some of the grains together. This is an uncatalogued specimen of the Franklin Mineral Museum.
Identifier: DPS9a 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
