Locality: Palermo Mine, N. Groton, NH
Specimen Size: 0.6 mm clump of rockbridgeite balls on mitridatite
Field Collected: From a tub of Palermo phosphate rocks gifted by Bob Whitmore
Catalog No.: u1889
Notes: EDS analyzed, BC64. The small amount of Si is likely a contaminant.
An early thought was that these dark balls might be dufrenite (reported from Palermo), but dufrenite requires a small amount of Ca. No Ca was detected in the EDS analysis. A modest amount of Mn indicates this is mangoan rockbridgeite. The webmineral.com analysis included in the link shows a favorable comparison with this specimen.
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 6 mm field of view. Dark sphalerite mass in center
Field Collected: From a tub of Palermo phosphate rocks gifted by Bob Whitmore
Catalog No.: u1890
Notes: EDS analyzed, BC62. The Na line is close to the Zn line and the S line is very close to the Pb line. These annotations on the EDS plot are very likely due to element miss-assignment by the EDS software. The large carbon peak is due to the carbon coat applied to the sample.
Not a remarkable specimen, but a good reference sample for sphalerite at the Palermo Mine. A number of rare Palermo phosphate minerals contain zinc, so specimens containing sphalerite should be closely examined for these rarities.
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 6 mm field of view. Dark sphalerite mass in center
Field Collected: From a tub of Palermo phosphate rocks gifted by Bob Whitmore
Catalog No.: u1891
Notes: Another EDS analyzed Palermo sphalerite, BC60. The Na line is close to the Zn line and the S line is very close to the Pb line. These annotations on the EDS plot are very likely due to element miss-assignment by the EDS software. The large carbon peak is due to the carbon coat applied to the sample.
Not a remarkable specimen, but a good reference sample for sphalerite at the Palermo Mine.
Locality: Mine Falls Park, Nashua, NH
Specimen Size: 0.3 mm orange-red anatase crystal in quartz crystal seam.
Field Collected: Tom Mortimer
Catalog No.: u555
Notes: This is a repeat photo of this specimen. This one with a Nikon Plan 10X/.025 microscope objective lens with a Canon G9.
Locality: Fletcher Mine, N. Groton, NH
Specimen Size: 0.8 mm fov
Field Collected: Clayton Ford. ex. Gordon Jackson
Catalog No.: e.g. u1954
Notes: Not a particularly good photo. Voucher specimen for stewartite at the Fletcher Mine.
Locality: Fletcher Mine, N. Groton, NH
Specimen Size: 0.5 mm fov
Field Collected: Clayton Ford. ex. Gordon Jackson
Catalog No.: e.g. u1954
Notes: Not a particularly good photo. Voucher specimen for stewartite at the Fletcher Mine.
Locality: Fletcher Mine, N. Groton, NH
Specimen Size: 2.2 mm fov
Field Collected: Clayton Ford. Ex. Gordon Jackson
Catalog No.: u1957
Notes:
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 0.2 mm pale-pink balls of rhodochrosite on siderite
Field Collected: From tub of Palermo rocks gifted by Bob Whitmore
Catalog No.: u1919
Notes:
Locality: Valencia Mine, N. Groton, NH
Specimen Size: 5.5 mm field of view
Field Collected: Dana Jewel - May, 1989
Catalog No.: A Bob Wilken specimen
Notes: An EDS analysis indicated a very iron rich rhodochrosite. (Carbon and oxygen do not show on this plot.)
Locality: Valencia Mine, N. Groton, NH
Specimen Size: 6.2 mm field of view
Field Collected: Dana Jewel - May, 1989
Catalog No.: A Bob Wilken specimen
Notes: Another view on this ferroan rhodochrosite specimen.
Locality: Valencia Mine, N. Groton, NH
Specimen Size: 4.3 mm field of view
Field Collected: Dana Jewel - May, 1989
Catalog No.: A Bob Wilken specimen
Notes: Another view on this ferroan rhodochrosite specimen.
Locality: Pike Quarry, Beech Hill, Carroll, NH
Specimen Size: 2.5 mm field of view
Field Collected: Bob Wilken 5/16
Catalog No.: TBC
Notes: Green mineral is epidote, black mineral is magnetite