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Biotite from
Barker Hill Quarry (Townsend Quarry; Rusk Quarry), Townsend, Middlesex Co., Massachusetts, USA

Description
Quality of samples:	not specified / average specimens
Confirmation
Validity:	Believed Valid
References
References:	Dale, T. Nelson (1910). Supplementary Notes on the Commercial Granites of New England. (USGS Bulletin 470).
Data
Mineral Data:	Click here to view Biotite data
Locality Data:	Click here to view Barker Hill Quarry (Townsend Quarry; Rusk Quarry), Townsend, Middlesex Co., Massachusetts, USA

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