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
Sourland Mountain, Hillsborough Township, Somerset County, New Jersey, USA


Locality type:Mountain
Classification
Species:'Tourmaline' (not an IMA approved species)
Formula:AD3G6(T6O18)(BO3)3X3Z
Comments:Occurs at the contact of the traprock and the sedimentary rocks.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tourmaline data
Locality Data:Click here to view Sourland Mountain, Hillsborough Township, Somerset County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:80171
Long-form Identifier:1:3:80171:9
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
11.3km (7.0 miles) ⓘGriggstown Mine (Franklin Mine), Griggstown, Franklin Township, Somerset County, New Jersey, USA
18.5km (11.5 miles) ⓘAmerican Mine (Alpha Copper Mine; Bridgewater Mine; Somerville Mine; Somerville deposit), Bridgewater Township, Somerset County, New Jersey, USA
22.1km (13.8 miles) ⓘLambertville Quarry (Trap Rock Industries Lambertville Quarry; Mt. Gilboa Quarry), Delaware Township, Hunterdon County, New Jersey, USA
23.0km (14.3 miles) ⓘGoat Hill Quarry, West Amwell Township, Hunterdon County, New Jersey, USA
40.3km (25.1 miles) ⓘMorristown occurrences, Morristown, Morris County, New Jersey, USA
40.7km (25.3 miles) ⓘCreager Mine (Confucius Mine), Karrsville, Mansfield Township, Warren County, New Jersey, USA
41.4km (25.7 miles) ⓘDaniel Horton Mine (Horton Mine), Randolph Township, Morris County, New Jersey, USA
47.7km (29.6 miles) ⓘMarble Mountain prospect, Marble Mtn, Phillipsburg, Warren County, New Jersey, USA
48.0km (29.8 miles) ⓘRoadcut, Phillipsburg, Warren County, New Jersey, USA
48.1km (29.9 miles) ⓘScrub Oaks Mine, Mine Hill, Morris County, New Jersey, USA
References
Manchester, James G. (1931) The Minerals of New York City and its Environs. Bulletin of the New York Mineralogical Club Vol. 3 (1). New York Mineralogical Clubp.92
 
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