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
Griggstown Mine (Franklin Mine), Griggstown, Franklin 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 Griggstown Mine (Franklin Mine), Griggstown, Franklin Township, Somerset County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:71970
Long-form Identifier:1:3:71970:0
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
11.3km (7.0 miles) ⓘSourland Mountain, Hillsborough Township, Somerset County, New Jersey, USA
22.1km (13.7 miles) ⓘAmerican Mine (Alpha Copper Mine; Bridgewater Mine; Somerville Mine; Somerville deposit), Bridgewater Township, Somerset County, New Jersey, USA
29.7km (18.4 miles) ⓘGoat Hill Quarry, West Amwell Township, Hunterdon County, New Jersey, USA
30.6km (19.0 miles) ⓘLambertville Quarry (Trap Rock Industries Lambertville Quarry; Mt. Gilboa Quarry), Delaware Township, Hunterdon County, New Jersey, USA
41.9km (26.1 miles) ⓘMorristown occurrences, Morristown, Morris County, New Jersey, USA
46.4km (28.8 miles) ⓘDaniel Horton Mine (Horton Mine), Randolph Township, Morris County, New Jersey, USA
50.3km (31.3 miles) ⓘCreager Mine (Confucius Mine), Karrsville, Mansfield Township, Warren County, New Jersey, USA
52.7km (32.7 miles) ⓘScrub Oaks Mine, Mine Hill, Morris County, New Jersey, USA
58.9km (36.6 miles) ⓘMarble Mountain prospect, Marble Mtn, Phillipsburg, Warren County, New Jersey, USA
59.3km (36.9 miles) ⓘRoadcut, Phillipsburg, Warren County, New Jersey, USA
References
NJ State Geol. Ann. Rpt. (1906):138.
 
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