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Tilcon Quarry-Riverdale Quarry, Riverdale, Passaic Co., New Jersey, USA
Photo: 2010 David S. Bernstein
Mineral List
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References
From the Tilcon web site:
""Riverdale, NJ – Riverdale Quarry has also operated for over 100 years. This is a granite gneiss quarry which has provided rock for the entrance steps and walkways from the National Mall to the Smithsonian’s National Museum of Natural History in Washington, DC. The coarse-grained pink rock with light green and gray mottling, called unakite by geologists, formed between 950 million and 1 billion years ago.""
""Riverdale, NJ – Riverdale Quarry has also operated for over 100 years. This is a granite gneiss quarry which has provided rock for the entrance steps and walkways from the National Mall to the Smithsonian’s National Museum of Natural History in Washington, DC. The coarse-grained pink rock with light green and gray mottling, called unakite by geologists, formed between 950 million and 1 billion years ago.""
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Locality Updated: San Miguel Mine, Moctezuma, Mun. de Moctezuma, Sonora, MexicoFrom David Von Bargen, 24th May 2013 23:52:46