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
Western portal, New York - Susquehanna & Western RR tunnel, Fairview, Bergen County, New Jersey, USA


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 vesuvianite hornfels associated with the Palisades diabase.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Western portal, New York - Susquehanna & Western RR tunnel, Fairview, Bergen County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:70774
Long-form Identifier:1:3:70774:1
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.6km (1.0 miles) ⓘNew York - Susquehanna & Western Railroad tunnel, Edgewater, Bergen County, New Jersey, USA
4.6km (2.9 miles) ⓘ82nd Street & Central Park West, Manhattan (New York County), New York City, New York, USA
7.5km (4.6 miles) ⓘ63rd Street Tunnel, Manhattan (New York County), New York City, New York, USA
8.8km (5.5 miles) ⓘTubby Hook occurrences, Manhattan (New York County), New York City, New York, USA
11.5km (7.1 miles) ⓘWorld Trade Center Site, Manhattan (New York County), New York City, New York, USA
24.8km (15.4 miles) ⓘLarchmont, Mamaroneck, Westchester County, New York, USA
29.6km (18.4 miles) ⓘHarrison, Westchester County, New York, USA
29.6km (18.4 miles) ⓘLake Street Quarry, Harrison, Westchester County, New York, USA
31.1km (19.3 miles) ⓘPompton Junction feldspar deposit, Pompton Lakes, Passaic County, New Jersey, USA
33.1km (20.6 miles) ⓘJersey City Water Supply Company Quarry, Montville Township, Morris County, New Jersey, USA
References
NJ State Geol. Ann. Rpt (1907):145.
 
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