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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Biotite from
New York - Susquehanna & Western Railroad tunnel, Edgewater, Bergen County, New Jersey, USA


Locality type:Tunnel
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Comments:Occurs in hornfels associated with trap rock (Palisades Diabase).
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view New York - Susquehanna & Western Railroad tunnel, Edgewater, Bergen County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:79218
Long-form Identifier:1:3:79218:3
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.6km (1.0 miles) ⓘWestern portal, New York - Susquehanna & Western RR tunnel, Fairview, Bergen County, New Jersey, USA
3.7km (2.3 miles) ⓘ82nd Street & Central Park West, Manhattan (New York County), New York City, New York, USA
6.6km (4.1 miles) ⓘ63rd Street Tunnel, Manhattan (New York County), New York City, New York, USA
7.9km (4.9 miles) ⓘTubby Hook occurrences, Manhattan (New York County), New York City, New York, USA
11.5km (7.2 miles) ⓘWorld Trade Center Site, Manhattan (New York County), New York City, New York, USA
23.5km (14.6 miles) ⓘLarchmont, Mamaroneck, Westchester County, New York, USA
28.4km (17.7 miles) ⓘLake Street Quarry, Harrison, Westchester County, New York, USA
28.4km (17.7 miles) ⓘHarrison, Westchester County, New York, USA
32.3km (20.1 miles) ⓘPompton Junction feldspar deposit, Pompton Lakes, Passaic County, New Jersey, USA
34.6km (21.5 miles) ⓘJersey City Water Supply Company Quarry, Montville Township, Morris County, New Jersey, USA
References
The Minerals of NYC & Its Environs, NY Min. Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 71.
 
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