Locality: Rice Mine, N. Groton, NH
Specimen Size: 1.3 mm field of view
Field Collected: Clayton Ford ±1970
Catalog No.: A Bob Wilken specimen and photo
Notes [bw] Visual ID.
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 1.7 mm field of view.
Field Collected: Bob Whitmore - from a tub of Palermo phosphate rocks gifted by Bob.
Catalog No.: u2454
Notes: On the same micro-boxed specimen with whitlockite was this corroded sulfide bleb (sphalerite?) sprinkled with these blocky yellow crystals. These yellow crystals had a preference for forming on the sulfide, or very near by (on some micro-crystalline messelite). I did not see them elsewhere on the piece. The dark background helps them to stand out. Jahnsite is a visual ID.
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 0.3 mm field of view, top photo
Field Collected: Bob Whitmore - from a tub of Palermo phosphate rocks gifted by Bob.
Catalog No.: u2454
Notes: A visual identification.
Locality: Palermo Mine, Groton, NH
Specimen Size: Top photo 5 mm field of view. Other views as noted.
Field Collected: From a tub gifted by Bob Whitmore
Catalog No.: u2522
Notes: Jahnsite crystals on mitridatite coated siderite crystals.
The jahnsite sub-group has 13 members. Jahnsite at the Palermo Mine is usually seen in crystal clumps. Distinct, isolated, crystals are uncommon.
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 0.1 mm field of view. VERY TINY !
Field Collected: Unknown
Catalog No.: A Ray Meyers collection specimen.
Notes: Ray Meyers purchased this as cyrilovite. Cyrilovite chemistry is NaFe+33(PO4)2 · 2H2O . Matrix is rockbridgeite-frondelite.
Dana's New Mineralogy, the Gaines, Skinner, Foord, et. al. eighth edition, 42.7.8.1, notes cyrilovite "Found at Palermo No. 1 mine, North Groton, NH."
Mindat.org photos of cyrilovite have a very broad range of habit and color.
Al Falster, MMGM lab, provided this EDS analyses from this specimen. Al probed six different spots on the sample. Four of the six were consistent with the plot here. Negligible sodium was detected, so cannot be cyrilovite. An EDS analyses from the Boston College instrument agreed with Al Falster's.
The "best fit" for this mineral appears to be jahnsite-CaMnFe. The crystal habit for a jansite group mineral is reasonable.
Locality: Fletcher Mine, Groton, NH
Specimen Size: 1.0 mm jahnsite crystal
Field Collected: Bob Wilken
Catalog No.: A Bob Wilken specimen and photo
Notes: A visual identification by Bob Wilken.A 2.58 mm fov; photo taken w. the Amscope 4X Plan Fluor; a photo stack of 93 w. 15 um increments.
Locality: Fletcher Mine, Groton, NH
Specimen Size: 2.6 mm field of view
Field Collected: Bob Wilken
Catalog No.: A Bob Wilken specimen and photo
Notes: A visual identification by Bob Wilken.
Photo taken with the Amscope 4X Plan. A photo stack of 93 images with 15 um increments.
Locality: Fletcher Mine, Groton, NH
Specimen Size: 1.4 mm field of view
Field Collected: Bob Wilken
Catalog No.: A Bob Wilken specimen and photo
Notes: A visual identification by Bob Wilken.
Photo taken with the Nikon Plan 10X; a stack of 61 with 15 um increments.
Locality: Fletcher Mine, Groton, NH
Specimen Size: 0.8 mm tall crystal
Field Collected: Clayton Ford. A gift from Gordon Jackson
Catalog No.: u1946
Notes: A visual identification.
Locality: Fletcher Mine, Groton, NH
Specimen Size: 1.2 mm field of view
Field Collected: Clayton Ford. A gift from Gordon Jackson
Catalog No.: u1950
Notes: A visual identification.