Locality: Palermo Mine, N. Groton, NH
Specimen Size: Vertical of larger crystal is about 0.75 mm
Field Collected: Bob Wilken
Catalog No.: A Bob Wilken specimen
Notes: An EDS analysis (PAL138 - carbon tape grain) indicated gordonite as the best fit.
Gordonite chemistry is: MgAl2(PO4)2(OH)2 · 8H2O [18 O total]
Chemistry from PAL138 EDS analysis: Mg1.2Al2(PO4)1.5O21 , normalized for two Al, ignoring tiny bit of Si and Zr -> likely miss-ID'ed.
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 1 mm gordonite crystal
Field Collected: Bob Wilken
Catalog No.: A Bob Wilken specimen
Notes:
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 1.2 mm field of view
Field Collected: Bob Wilken
Catalog No.: A Bob Wilken specimen
Notes:
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 1.5 mm field of view
Field Collected: Bob Wilken
Catalog No.: A Bob Wilken specimen, UK134
Notes: An EDS analysis (PAL134 - carbon tape grain) suggested segelerite as the best fit for this specimen.
Segelerite chemistry is: CaMgFe3+(PO4)2(OH) · 4H2O
Chemistry of this analysis: CaMg1.11(Fe+Mn)1.08(PO4)3.26(OH) · 24H2O normalized for one Ca.
This chemistry shows a Ca:Mg:(Mn+Fe) ratio close to segelerite's 1:1:1, with some Mn substituting for Fe. The tiny amounts of Ti, Al, and Ba are ignored. Yes, the APFU computed phosphorous and oxygen contents are high.
[tm] It would not be difficult to mistake this for the more common strunzite.
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 3 mm field of view
Field Collected: Bob Wilken
Catalog No.: A Bob Wilken specimen, UK137
Notes: An EDS analysis (PAL137 - polished grain) suggested segelerite as the best fit for this specimen.
Segelerite chemistry is: CaMgFe3+(PO4)2(OH) · 4H2O
Chemistry of this analysis: CaMg0.45Fe1.10(PO4)3.3(OH) · 14H2O normalized for one Ca.
This chemistry shows a Ca:Mg:Fe ratio of about 1:0.5:1, or low Mg for segelerite Again, the APFU computed phosphorous and oxygen contents are high.
This Palermo segelerite visually compares very favorably with mindat photo mindat segelerite .
Locality: Turner Mine, Marlow, NH
Specimen Size: Radiating masses 4.0 mm across
Field Collected: Bob Wilken
Catalog No.: A Bob Wilken specimen, UK137
Notes: An EDS analysis (TUR04 - polished grain) suggested Arseniosiderite as the best fit for this specimen.
Arseniosiderite chemistry is: Ca2Fe3+3(AsO4)3O2 · 3H2O
Chemistry of this analysis: Ca2Fe0.98(AsO4)1.3O37 normalized for two Ca. This is light on both the Fe and As for arseniosiderite.
There are seven IMA minerals that contain only Fe, As, Ca, and O:
Arseniosiderite [mindat has 149 photos, far more than any other candidate, so implies most common of the candidates], Barahonaite-(Fe) [typically green & crusty], Kolfanite [An insufficiently described Ca-Fe-arsenate; possibly identical to arseniosiderite], Lazarenkoite [color given as bright orange, structure of mindat photos is not dissimilar to this Turner sample], Sewardite [typically tiny blocky crystals, plates & crusts], Walentaite [some photos have radial structure, can be yellow, brownish, greenish, has 3X more Fe than Ca], Wallkilldellite-(Fe) [tiny, scaly, aggregates], Yukonite [photos show mostly brown balls & crusts. has 3X more Ca than Fe]
This list illustrates the difficulty of assigning a species to an analysis that is not a particularly good match for anything. Additional EDS data collections from the polished grain sample is recommended.
Locality: Bugsmouth Hill, Newton, NH
Specimen Size: 8 cm specimen. Sanidine crystals embedded in trachite.
Field Collected: Tom Mortimer - 10/12/17
Catalog No.: TBC
Notes: Reference: McHone and Sundeen, Mesozoic and Igneous Rocks in Southeastern New Hampshire NEIGC95 (1995) pg. C2-17, describes the occurrence at Bugsmouth Hill of a fine-grained rhyolite with small alkali feldspars. An XRD is planned for this sanidine.
Locality: Palermo #2 Mine, N. Groton, NH
Specimen Size: Top photo 3.5 mm field of view. Lower photo - 2 mm field of view
Field Collected: Jim Nizamoff
Catalog No.: TBC
Notes: Jim Nizamoff stated that whiteite is usually found associated with fairfieldite, as is the case here. Note the flat, to slightly off-axis, terminations of these whiteite crystals, a noted characteristic of Palermo #2 whiteite. A follow-on email from Jim said: "specimen is a trim from a larger piece that was used for the painting by Fred Wilda in Bob's book. I thought that particular piece had the most aesthetic whiteite I had seen at Palermo No. 2. ... Wish I had a lot more like that, usually whiteite is really tiny."
Locality: Palermo #2 Mine, N. Groton, NH
Specimen Size: 1.3 mm field of view.
Field Collected: Jim Nizamoff
Catalog No.: TBC
Notes:
Locality: Rt. 89 Road Cut, New London, NH
Specimen Size: 3 mm field of view.
Field Collected: Bob Whitmore
Catalog No.: u935
Notes: [tm] I had these identified as torbernite for many years The vertical, leak green, somewhat octagonal, crystal is indicative of the true color. The square plates have a lot of reflected light.
In July, 2017, Fred Davis wrote: "I looked at the "torbernite" from I-89 I purchased at MMNE in the micromount box. I did a "bulk" analysis over a 3mm circle covered with the flat, square crystals. No copper - not even a whiff, [tm - required for torbernite]. I think it's also phosphuranylite (got all the right elements)."
Locality: Corson Mine, Nottingham, NH
Specimen Size: 4 mm pale-green apatite crystal in albite matrix
Field Collected: Tom Mortimer - 8/30/08
Catalog No.: u2117
Notes: