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Tilcon Quarry-Riverdale Quarry, Riverdale, Passaic Co., New Jersey, USA

A large granite quarry in the Pompton Granite.

"Riverdale, New Jersey – 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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Tilcon Corp. web site.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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