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Mullica Hill, Harrison Township, Gloucester Co., New Jersey, USA

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Latitude & Longitude (WGS84): 39° 43' 59'' North , 75° 13' 45'' West
Latitude & Longitude (decimal): 39.7333333333, -75.2294444444

An unincorporated population center (hamlet) within Harrison Township. Located about 25km SSW of Camden.

Cretaceous sedimentary rock with phosphate nodules and phosphate replacement of fossils (belemnites).

Mullica Hill has long been known for vivianite which occurs principally as a replacement of calcareous fossils, belemnites and oyster-like shells of exogyra. These phosphatized fossils are found in the Navasink formation, a glauconitic sand of latest Cretaceous age. The locality is often described in the literature as being “along the banks of Raccoon Creek”. This is not exactly true for the locality that has produced phosphates since the 1970’s.

The site that has produced ferrostrunzite and other phosphate minerals, that are oxidation products of vivianite, is a small area on the bank of a tributary to Raccoon Creek. This tributary is usually dry but has created a significant ravine. The actual site is approximately 650 feet southwest from the west side of the parking lot of the Raccoon Valley Swim Club off the end of Church Street in Mullica Hill. At this locality, the bank of the west side of the ravine projected outward slightly into the ravine. The sediments of the Navasink formation, normally greenish, were oxidized to yellowish orange. Because of the clay content of the material one could get extremely dirty, very quickly while searching for specimens.

Mineral List

Mineral list contains entries from the region specified including sub-localities

9 valid minerals. 1 (TL) - type locality of valid minerals. 1 erroneous literature entry.

Localities in this Region

  • New Jersey

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Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 745.

Mineralogical Record (1980): 11: 9-10.

Henderson, Wm. A. (1980): Mullica Hill, New Jersey. Mineralogical Record: 11: 307-311.

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