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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Heulandite Subgroup from
Griggstown Mine (Franklin Mine), Griggstown, Franklin Township, Somerset County, New Jersey, USA


Locality type:Mine
Classification
Species:'Heulandite Subgroup' (not an IMA approved species)
Formula:(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Comments:Occurs in diabase.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Heulandite Subgroup 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:79110
Long-form Identifier:1:3:79110:2
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
18.9km (11.8 miles) ⓘChimney Rock Quarry, Bridgewater Township, Somerset County, New Jersey, USA
27.5km (17.1 miles) ⓘWilson's Quarry (Wilson Stone Co. Quarry), Watchung, Somerset County, New Jersey, USA
28.2km (17.5 miles) ⓘTrap Rock Industries Moores Station Quarry, Moore, Hopewell Township, Mercer County, New Jersey, USA
29.1km (18.1 miles) ⓘMercer County Workhouse Quarry, Moore, Hopewell Township, Mercer County, New Jersey, USA
29.6km (18.4 miles) ⓘMillington Quarry, Bernards Township, Somerset County, New Jersey, USA
30.5km (19.0 miles) ⓘOldwick Quarry (Stavola Quarry), Tewksbury 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
31.7km (19.7 miles) ⓘFanwood Quarry (Weldon Quarry), Watchung, Somerset County, New Jersey, USA
32.6km (20.3 miles) ⓘFerrante Quarry, Bernardsville, Somerset County, New Jersey, USA
39.2km (24.3 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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