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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Chalcedony from
American Mine (Alpha Copper Mine; Bridgewater Mine; Somerville Mine; Somerville deposit), Bridgewater Township, Somerset County, New Jersey, USA


Locality type:Mine
Classification
Species:Quartz var: Chalcedony
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcedony data
Locality Data:Click here to view American Mine (Alpha Copper Mine; Bridgewater Mine; Somerville Mine; Somerville deposit), Bridgewater Township, Somerset County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:79113
Long-form Identifier:1:3:79113:9
GUID (UUID V4):0
Nearest other occurrences of Chalcedony
3.9km (2.4 miles) ⓘPluckemin, Bedminster Township, Somerset County, New Jersey, USA
5.5km (3.4 miles) ⓘChimney Rock Quarry, Bridgewater Township, Somerset County, New Jersey, USA
6.5km (4.0 miles) ⓘLiberty Corner, Bernards Township, Somerset County, New Jersey, USA
9.5km (5.9 miles) ⓘLyons Station, Lyons, Bernards Township, Somerset County, New Jersey, USA
9.8km (6.1 miles) ⓘMillington Quarry, Bernards Township, Somerset County, New Jersey, USA
12.4km (7.7 miles) ⓘStirling Brook ("Carnelian Creek"), Warren Township, Somerset County, New Jersey, USA
14.6km (9.1 miles) ⓘWilson's Quarry (Wilson Stone Co. Quarry), Watchung, Somerset County, New Jersey, USA
18.4km (11.5 miles) ⓘFanwood Quarry (Weldon Quarry), Watchung, Somerset County, New Jersey, USA
24.3km (15.1 miles) ⓘTrap Rock Industries Kingston Quarry, Kingston Trap Rock Quarry, Franklin Township, Somerset County, New Jersey, USA
25.7km (16.0 miles) ⓘHoudaille Quarry (Summit Quarry; Commonwealth Quarry), Springfield, Springfield Township, Union County, New Jersey, USA
References
The Minerals of NYC & Its Environs, NY Min. Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 35. .
 
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