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Amblygonite from
Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield County, Connecticut, USA

Locality type:Quarry
Classification
Species:Amblygonite
Formula:LiAl(PO4)F
Comments:Penfield's 1879 analysis of a Branchville specimen showed an OH:F ratio of 1.02, making this specimen montebrasite as now defined. Many references are not specific to species, back then all of the massive lithium phosphate of this series was generically called "amblygonite". It is now known that the amblygonite species is incredibly uncommon even in localities which have fluorite, massive fluorapatite, and topaz. Therefore, specimens from this locality are most likely montebrasite.
Confirmation
Validity:Erroneously Reported
References
References:Januzzi, Ronald E. (1959): The Minerals of Western Connecticut and Southeastern New York. The Mineralogical Press, Danbury, Connecticut.
Data
Mineral Data:Click here to view Amblygonite data
Locality Data:Click here to view Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield County, Connecticut, USA
Nearest other occurrences of Amblygonite
79.3km (49.3 miles) Strickland Quarry (Eureka Quarry), Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries), Collins Hill, Portland, Middlesex Co., Connecticut, USA
 
Mineral and/or Locality  
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