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Chalcocite from
Union Building and Construction Quarry, Woodland Park, Passaic County, New Jersey, USA


Locality type:Quarry
Classification
Species:Chalcocite
Formula:Cu2S
Comments:Sooty chalcocite was found in a very local lens of carbonaceous debris in the Passaic sediments a foot or two beneath the basalt. Some of the chalcocite had altered to malachite.

This very small occurrence is a typical Red Bed Type copper deposit in miniature. Base metals, particularly copper and silver, are mobile in oxidized, chloride-rich brines. Such brines are common in first generation red beds like those of the Passaic Formation. Deposition occurs when the oxidized metal-bearing fluid encounters a reducing environment. Reduction is typically provided by pyrite in a carbonaceous shale or by sulphate reducing bacteria associated with carbonaceous shale. The copper deposits further south in the Watchungs, such as at Chimney Rock, are also Red Bed Type deposits but in these examples reduction was accomplished by the oxidation of ferrous iron to ferric iron and the concurrent reduction of sulphate to sulphide in the basalt, an atypical mechanism.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcocite data
Locality Data:Click here to view Union Building and Construction Quarry, Woodland Park, Passaic County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:507627
Long-form Identifier:1:3:507627:7
GUID (UUID V4):c20c5da5-3b19-47d8-8c5b-dfb11d9b0f25
Nearest other occurrences of Chalcocite
1.1km (0.7 miles) Houdaille Quarry, Little Falls Township, Passaic County, New Jersey, USA
1.7km (1.1 miles) Francisco Brothers Quarry, Great Notch, Little Falls Township, Passaic County, New Jersey, USA
3.2km (2.0 miles) Upper New Street Quarry, Paterson, Passaic County, New Jersey, USA
4.1km (2.5 miles) McDowell's Quarry (Osborne and Marsellis Quarry), Upper Montclair, Montclair, Essex County, New Jersey, USA
7.2km (4.5 miles) Prospect Park Quarry, Prospect Park, Passaic County, New Jersey, USA
7.7km (4.8 miles) Avondale, Nutley, Essex County, New Jersey, USA
8.6km (5.4 miles) Glen Ridge Mines, Glen Ridge, Essex County, New Jersey, USA
11.0km (6.8 miles) Dod Mine, East Orange, Essex County, New Jersey, USA
12.1km (7.5 miles) Schuyler Copper Mine, North Arlington, Bergen County, New Jersey, USA
15.7km (9.7 miles) Laurel Hill, Secaucus, Hudson County, New Jersey, USA
References
Reference Search (possible matching items)
Book
MineralogicalRecord.com I IIMORIITE-(Y) EUROPE FRANCE Trimouns quarry, Luzenac, Ariege. Operated for talc since the beginning...beginning of the 20th century, the Trimouns quarry became well known to collectors around 1990 for the...iimoriite-(Y) occurs at Trimouns as colorless, pink and pale brown, translucent to transparent, tabular microcrystals...microcrystals on matrix of white dolomite, and rarely as doubly terminated crystals to I cm floating...long (Marty, 2004 ). AFRICA widely in Litchfield County, where good crystals were taken from quartz veins
Report (issue)
Mesozoic Magmatism iS) Edited by John H. Puffer and Paul C. Ragland * » Eastern North American Mesozoic...Geology Department Rutgers University Newark, New Jersey 07102 and Paul C. Ragland Department of Geology Florida..."Y\o. Z All materials subject to this copyright and included in this volume may be photocopied for the...America Mesozoic magmatism / edited by John H. Puffer and Paul C. Ragland. p. cm. — (Special paper / Geological...bibliographical references and index. ISBN 0-8137-2268-3 1. Magmatism—New England. 2. Magmatism—Maritime
 
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