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Columbite-(Fe)-Columbite-(Mn) Series from
Biermann Quarries (Bethel quarries) and tourmaline ledge, Bethel, Fairfield County, Connecticut, USA

Classification
Species:'Columbite-(Fe)-Columbite-(Mn) Series' (not an IMA approved species)
Formation:Primary
Comments:Good prismatic crystals formed in quartz, also hand-sized subhedral masses with striations from neighboring muscovite. Januzzi (1976) reports that a beryl crystal with a large columbite crystal projecting from it was donated to the American Museum of Natural History in New York City. The ID is generic, at least one crystal was tested using Raman spectroscopy and the best match is tantalite-(Fe) (see entry). A crystal formerly in the Bill Shelton collection has a specific gravity of 6.7, making it clearly a columbite species.
Habit:flat, elongated prisms or subhedral masses
Colour:black, with iridescence
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Rare
Confirmation
Validity:Believed Valid
References
References:Januzzi, Ronald E. (1976), Mineral Localities Connecticut and Southeastern New York State. The Mineralogical Press, Danbury, Connecticut.; Weber, Marcelle H. and Earle C. Sullivan (1995), Connecticut Mineral Locality Index. Rocks & Minerals (Connecticut Issue): 70(6): 396.
Data
Mineral Data:Click here to view Columbite-(Fe)-Columbite-(Mn) Series data
Locality Data:Click here to view Biermann Quarries (Bethel quarries) and tourmaline ledge, Bethel, Fairfield County, Connecticut, USA
Photo GalleryView Gallery (9 photos)
Nearest other occurrences of Columbite-(Fe)-Columbite-(Mn) Series
1.9km (1.2 miles) Captain Cook's Quarry (Purdy Station Quarry), Newtown, Fairfield County, Connecticut, USA
6.4km (4.0 miles) Redding (Reading), Fairfield County, Connecticut, USA
9.7km (6.0 miles) Agstone Company Limestone Quarry, Danbury, Fairfield County, Connecticut, USA
13.9km (8.6 miles) East Village pegmatite, Monroe, Fairfield County, Connecticut, USA
15.4km (9.6 miles) Casey Quarry (Ridgefield pegmatite), Ridgefield, Fairfield County, Connecticut, USA
18.1km (11.2 miles) Curtis Quarry (Southford Quarry; Southford pegmatite; Southbury rose quartz quarry; Bridgeport Woodfinishing Co. Quarry; Hulls Hill), Southford, Southbury, New Haven Co., Connecticut, USA
27.8km (17.3 miles) Woodbury pegmatite quarry, Woodbury, Litchfield Co., Connecticut, USA
29.4km (18.3 miles) Kinkel Quarry, Bedford, Westchester Co., New York, USA
29.7km (18.4 miles) Baylis Quarry (Bayliss Quarry), Bedford, Westchester Co., New York, USA
29.7km (18.4 miles) Bedford, Westchester Co., New York, USA
 
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