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
63rd Street Tunnel, Manhattan (New York County), New York City, New York, 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
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view 63rd Street Tunnel, Manhattan (New York County), New York City, New York, USA
Data Identifiers
Mindat Occurrence Record ID:485756
Long-form Identifier:1:3:485756:3
GUID (UUID V4):0
Nearest other occurrences of Biotite
2.9km (1.8 miles) ⓘ82nd Street & Central Park West, Manhattan (New York County), New York City, New York, USA
6.6km (4.1 miles) ⓘNew York - Susquehanna & Western Railroad tunnel, Edgewater, Bergen County, New Jersey, USA
7.2km (4.5 miles) ⓘWorld Trade Center Site, Manhattan (New York County), New York City, New York, USA
7.5km (4.6 miles) ⓘWestern portal, New York - Susquehanna & Western RR tunnel, Fairview, Bergen County, New Jersey, USA
12.4km (7.7 miles) ⓘTubby Hook occurrences, Manhattan (New York County), New York City, New York, USA
25.3km (15.7 miles) ⓘLarchmont, Mamaroneck, Westchester County, New York, USA
30.5km (18.9 miles) ⓘLake Street Quarry, Harrison, Westchester County, New York, USA
30.5km (18.9 miles) ⓘHarrison, Westchester County, New York, USA
38.2km (23.7 miles) ⓘVoorhis Quarry, Greenwich, Fairfield County, Connecticut, USA
38.4km (23.9 miles) ⓘPompton Junction feldspar deposit, Pompton Lakes, Passaic County, New Jersey, USA
References
Specimen in collection of Steve Stuart
 
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