Diopside



The two halves of the glacial cobble shown in photo DPS9a, separated to show the interior. Most of the cobble consists of massive, faintly yellow diopside, bordered on one side (upper left as shown) by coarse-grained, pale gray calcite containing scattered, tiny flecks of graphite.

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Two halves of a stream-rounded cobble consisting mostly of diopside with a little calcite

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Identifier: DPS9b
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