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


Locality type:Mine
Classification
Species:'Tourmaline' (not an IMA approved species)
Formula:AD3G6(T6O18)(BO3)3X3Z
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tourmaline 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:79116
Long-form Identifier:1:3:79116:6
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
18.5km (11.5 miles) ⓘSourland Mountain, Hillsborough Township, Somerset County, New Jersey, USA
21.8km (13.6 miles) ⓘMorristown occurrences, Morristown, Morris County, New Jersey, USA
22.1km (13.7 miles) ⓘGriggstown Mine (Franklin Mine), Griggstown, Franklin Township, Somerset County, New Jersey, USA
24.3km (15.1 miles) ⓘDaniel Horton Mine (Horton Mine), Randolph Township, Morris County, New Jersey, USA
30.7km (19.1 miles) ⓘScrub Oaks Mine, Mine Hill, Morris County, New Jersey, USA
32.6km (20.3 miles) ⓘCreager Mine (Confucius Mine), Karrsville, Mansfield Township, Warren County, New Jersey, USA
37.6km (23.4 miles) ⓘBEMCO prospect (Charlotte Mine), Cranberry Lake, Byram Township, Sussex County, New Jersey, USA
38.1km (23.7 miles) ⓘLambertville Quarry (Trap Rock Industries Lambertville Quarry; Mt. Gilboa Quarry), Delaware Township, Hunterdon County, New Jersey, USA
40.4km (25.1 miles) ⓘGoat Hill Quarry, West Amwell Township, Hunterdon County, New Jersey, USA
47.7km (29.6 miles) ⓘMarble Mountain prospect, Marble Mtn, Phillipsburg, Warren 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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