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Biotite from
U. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield County, Connecticut, USA

Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
Comments:Included in a list of minerals without details, but plausible for the geology.
Confirmation
Validity:Believed Valid
References
References:Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. The Mineralogical Press, Danbury, Connecticut.
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view U. S. Route 7 Expressway (Danbury line to Iron Works District), Brookfield, Fairfield County, Connecticut, USA
Nearest other occurrences of Biotite
3.0km (1.8 miles) Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
6.7km (4.2 miles) North Street mall, Danbury, Fairfield County, Connecticut, USA
7.8km (4.9 miles) Danbury, Fairfield County, Connecticut, USA
9.9km (6.1 miles) Green's Farm locality (Roxbury garnet mine; Roxbury Falls garnet mine; Garnet Hill), Roxbury, Litchfield Co., Connecticut, USA
10.4km (6.4 miles) Western Connecticut State College, Danbury, Fairfield County, Connecticut, USA
14.1km (8.8 miles) Rockside Quarry (Mine Hill Quarry), Mine Hill (Ore Hill), Roxbury, Litchfield Co., Connecticut, USA
16.3km (10.1 miles) New England Materials quarry, Monroe, Fairfield County, Connecticut, USA
17.1km (10.7 miles) Kyanite locality (Judds Bridge locality), Washington, Litchfield Co., Connecticut, USA
17.4km (10.8 miles) Redding Glen (Redding Ridge), Redding (Reading), Fairfield County, Connecticut, USA
18.1km (11.2 miles) Nonnewaug River Industrial Park, Woodbury, Litchfield Co., Connecticut, USA
 
Mineral and/or Locality  
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