Locality: Government Pit, Albany, NH
Specimen Size: 1.2 mm Columbite-Mn crystal
Field Collected: Gene Bearss
Catalog No.: Gene Bearss # 1982C. Now with the MMGM collection #2014.142.5454
Notes: This is a redo of a 2015 photo from a batch of micros that Gene loaned me to photo. Gene's micro collection was acquired by the Maine Mineralogical and Gem Museum. The museum loaned me this specimen to re-photo.
It is unknown what testing Gene had done to identify this as columbite-Mn.
Locality: Corson Mine, Nottingham, NH
Specimen Size: 3 mm columbite-Mn crystal in albite vug
Field Collected: Tom Mortimer - 8/30/08
Catalog No.: u2278
Notes: Similar specimen, u932, from Corson Mine was EDS analyzed . Columbite-Mn is much rarer in NH than Columbite-Fe.
Locality: Turner Mine, Marlow, NH
Specimen Size: 10.5 mm crystal
Field Collected: Bob Wilken
Catalog No.: Bob Wilken specimen and photo
Notes: A polished grain weight% oxide EDS analysis, normalized for 6 oxygen, gave Nb0.75Ta0.38Mn2.61Fe0.54O6 .
[tm] With Nb >> Ta, this indicates Columbite-Mn.