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
Beach Glen Mines (Beach Glenn Mine), Hibernia, Rockaway Township, Morris County, New Jersey, USA


Locality type:Mine
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 Beach Glen Mines (Beach Glenn Mine), Hibernia, Rockaway Township, Morris County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:71071
Long-form Identifier:1:3:71071:8
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.5km (0.9 miles) ⓘUnnamed pegmatites, Wildcat Ridge Wildlife Management Area, Rockaway Township, Morris County, New Jersey, USA
4.3km (2.7 miles) ⓘTorne Quarry, Powerville, Boonton Township, Morris County, New Jersey, USA
5.3km (3.3 miles) ⓘMount Hope Mines (Mt Hope Mines), Mount Hope, Rockaway Township, Morris County, New Jersey, USA
7.1km (4.4 miles) ⓘCopperas Mine, Copperas Mountain, Rockaway Township, Morris County, New Jersey, USA
7.5km (4.6 miles) ⓘAllen Mine, Rockaway Township, Morris County, New Jersey, USA
8.1km (5.1 miles) ⓘLake Valhalla Quarry (Gordon's Crystalline Limestone Quarry), Montville Township, Morris County, New Jersey, USA
8.1km (5.1 miles) ⓘMontville serpentine deposit, Montville Township, Morris County, New Jersey, USA
8.8km (5.5 miles) ⓘThomas Fanning's Quarry, Dover, Morris County, New Jersey, USA
8.9km (5.5 miles) ⓘJersey City Water Supply Company Quarry, Montville Township, Morris County, New Jersey, USA
9.8km (6.1 miles) ⓘMase Mountain, Tierneys Corner, Jefferson Township, Morris County, New Jersey, USA
References
NJ State Geol. Ann. Rpt: (1886):136.
The Iron Mines of NJ (1910), Bayley:471
 
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