Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Chalcocite from
McDowell's Quarry (Osborne and Marsellis Quarry), Upper Montclair, Montclair, Essex County, New Jersey, USA


Locality type:Quarry
Classification
Species:Chalcocite
Formula:Cu2S
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcocite data
Locality Data:Click here to view McDowell's Quarry (Osborne and Marsellis Quarry), Upper Montclair, Montclair, Essex County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:73221
Long-form Identifier:1:3:73221:5
GUID (UUID V4):0
Nearest other occurrences of Chalcocite
3.0km (1.8 miles) ⓘFrancisco Brothers Quarry, Great Notch, Little Falls Township, Passaic County, New Jersey, USA
3.0km (1.9 miles) ⓘHoudaille Quarry, Little Falls Township, Passaic County, New Jersey, USA
4.1km (2.5 miles) ⓘUnion Building and Construction Quarry, Woodland Park, Passaic County, New Jersey, USA
5.2km (3.2 miles) ⓘGlen Ridge Mines, Glen Ridge, Essex County, New Jersey, USA
6.3km (3.9 miles) ⓘAvondale, Nutley, Essex County, New Jersey, USA
7.1km (4.4 miles) ⓘUpper New Street Quarry, Paterson, Passaic County, New Jersey, USA
7.2km (4.5 miles) ⓘDod Mine, East Orange, Essex County, New Jersey, USA
10.4km (6.4 miles) ⓘSchuyler Copper Mine, North Arlington, Bergen County, New Jersey, USA
11.1km (6.9 miles) ⓘProspect Park Quarry, Prospect Park, Passaic County, New Jersey, USA
14.4km (8.9 miles) ⓘLaurel Hill, Secaucus, Hudson County, New Jersey, USA
References
NJ Geol. Survey Bull. #64 (1960), Mason, B.
Peters, Joseph J. (1984) Triassic Traprock Minerals of New Jersey. Rocks & Minerals, 59 (4) 157-183 doi:10.1080/00357529.1984.11764472
 
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