A 1970's housing development built atop the summit of Riker Hill in the Hook Mountain (Third Watchung) basalt. Blasting was necessary to remove rock for the construction of foundations and utility trenches. Mineralization occurred in amygdaloidal cavities in the basalt.
Ref.:
Manchester, J.G. (1931) The Minerals of New York City and Its Environs. New York Mineralogical Club Bulletin, 3:89.
Pollack, R. (1977) Riker Hill, New Jersey -- An Active Collecting Area. Rocks & Minerals, 52:541-2
Rothstein, J. (1978) The Minerals of Riker Hill, Livingston, New Jersey. Lapidary Journal, 32:1124-35
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Map Reference: 40°49'8"N , 74°17'52"W
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