Rare and Uncommon New Hampshire Mineral Species Return to front page. Click on image for larger view | |
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Species: HUMBOLDTINE Locality: Government Pit, Albany, NH Confidence: 5 Chemistry: Fe2+(C2O4) · 2H2O Specimen Size: 7.5 mm field of view. Field Collected: Leroy Grant Catalog No.: 2138 Notes: Humboldtine confirmed by EDS analysis and Raman analysis. Red arrow points to sample point for EDS analysis grain. |
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Species: HYDROKENOELSMOREITE ? Locality: Johnson Rd., Bow, NH Confidence: 2 Chemistry: [ ]2W2O6(H2O) Specimen Size: 1.5 mm field of view Field Collected: 2016 Catalog No.: A Bob Wilken specimen and photo Notes: [bw] "These are definitely cubes with a mirror-like luster. There's no way they can be anglesite. A possibility that I've been wondering about is galena. It doesn't usually form individual, separate cubes that I've seen. But, maybe it could if it were to condense from hot gases. On the other hand, these little cubes are usually in vugs where other sulfides seem to have deteriorated. And, often there is a bluish covellite-look to the crusty coating surrounding them. It's what again makes me think the Pb has recombined with Cu to form murdochite." An Octobr, 2018 carbon tape grain EDS analyses showed only tungston and oxygen, suggesting hydrokenoelsmoreite, [ ]2W2O6(H2O), as a possible species. |
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Species: HYDROKENOELSMOREITE ? Locality: Johnson Rd., Bow, NH Specimen Size: 1.2 mm field of view Field Collected: 2016 Catalog No.: TBC Notes: Stack of 15 images in 0.01 increments with Nikon Plan 10 objective and Canon G9 camera. These are not as lustrous as those in Bob Wilken's photo. |
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Species: HYDROKENOELSMOREITE ? Locality: Johnson Rd., Bow, NH Specimen Size: 1.1 mm field of view Field Collected: 2016 Catalog No.: u2213 Notes: Oriented for cube face reflection. Helicon Focus stacking software method C (top) and method A (lower) on same image stack. |
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Species: HYDROPLUMBITE Confidence: 3 Chemistry: 3PbO · H2O Locality: Johnson Rd., Bow, NH Specimen Size: 9 mm field of view. Field Collected: 2016 Catalog No.: u2136 Notes: Perhaps hydroplumbite, a hydrated lead oxide, the only Pb oxide that is white. This powdery white unknown has shown up on several specimens. It appears to be an weathering product of galena. This small chunk is solid galena, except for this powdery crust. I cannot find any photos of hydroplumbite. Mindat has it as "Approved, grandfathered, questionable." It is not listed in my 2008 Fleisher's. Tests: Not fluorescent. Not soluble in water or muriatic acid. A carbon tape grain EDS analyses (BC286 - set 19) indicated a lead mineral with oxygen. Unfortunately, the EDS did not resolve an ambiguity of lead and sulfur, so the possibility of powdered anglesite cannot be eliminated. The tiny bit of aluminum in the plot is likely a contaminant. |
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Species: HYDROSYNCHYSITE-(Ce) Locality: Water Pocket Locality, Albany, NH Confidence: 3 Chemistry: Ca(Ce,La)(CO3)2(OH) Specimen Size: 4 mm field of view Field Collected: Bob Wilken - 8/29/17 Catalog No.: u2293 Notes: A January 2020 polished grain EDS analysis [bw WPV13] suggested hydrosynchysite-(Ce). No fluorine was detected (at 0.677 KeV). The unlabeled peak just above the carbon is the oxygen line. A blocky bertrandite crystal is in the lower foreground. The broken hexagonal hydrosynchysite-(Ce) crystals show zoning. The black mineral is believed to be ilmenite. |
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Species: HYDROSYNCHYSITE-(Ce) on Bertrandite Locality: Water Pocket Locality, Albany, NH Specimen Size: 0.4 mm brown prismatic crystal on bertrandite crystal Field Collected: Bob Wilken - 8/29/17 Catalog No.: u2293 Notes: Another view from u2293. |
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Species: HYPERSTHENE Confidence: 2 Chemistry: (Mg,Fe)SiO3 Locality: Aggregate Industries Quarry, Raymond, NH Specimen Size: TBD Field Collected (owner): Peter Cristofono Notes: [PC] "Hypersthene? from monzonite. It looks to be a pyroxene based on cleavage, and if so apparently hypersthene according to Freedman (1950); However, I don't think it can be visually distinguished with certainty from augite." [TM] Phillip Morrill did report hypersthene from New Hampshire. |
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Species: ISHIKAWAITE Confidence: 3 Chemistry: U4+Fe2+Nb2O8 Locality: Oliver Trench, Moat Mtn., Hale's Location, NH Specimen Size: 3.5 mm field of view Field Collected: Bob Janules Catalog No.: A Bob Janules collection specimen Notes: A Bob Janules submitted EDS analysis suggested ishikawaite. The spectral response at about 0.4 Kev, labeled Al, is suspect. Aluminum should give a response at 1.48 KeV. Photo with Canon T3i, 50 mm Canon lens,1 cm extension tube, plus Nikon Plan 10 microscope objective. Helicon Focus. |
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Species: KAHLERITE Confidence: 5 Chemistry: Fe(UO2)2(AsO4)2 · 10-12H2O Locality: Parker Mtn. Mine, Center Strafford, NH Specimen Size: 1 mm field of view, top photo. Tiny rectangular, paper-thin, plates of kahlerite. Catalog No.: u2028 Field Collected: Bob Janules Owner: Tom Mortimer Analysis: Kahlerite confirmed by EDS analysis. Notes: Only two Parker Mtn. kahlerite specimens are known. The other is in the collection of Dana Morong. Altering lollingite is present with scorodite on this specimen and is likely the source of the arsenic. |
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Species: KAHLERITE Locality: Parker Mtn. Mine, Center Strafford, NH Specimen Size: 2 mm field of view. Kahlerite (coated?) in lollingite vug Field Collected - Owner: Dana Morong Catalog No.: A Dana Morong collection specimen Notes: |
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Species: MAGNESITE Confidence: 4 Chemistry: Mg(CO3) Locality: Charles Davis Mine, N. Groton, NH Specimen Size: 8 mm magnesite crystal Field Collected: Anna Wilken Catalog No.: A Anna Wilken collection specimen Notes: Magnesite is an unusual species to find in a pegmatite environment. Under the scope, rhombic carbonate cleavage is observed. Bubbles formed on surface of a grain in cold muriatic acid. EDS analysis showed only magnesium, oxygen and some likely carbon, (carbon was disabled from the analysis because the polished grain was carbon coated.) The polished grain was probed in two spots and both gave the same result. I [tm] asked Jim Nizamoff for his opinion on the magnesite identification. he replied: "I agree that magnesite in a pegmatite is pretty much unheard of. I do believe that Mg can be concentrated in small areas in the right environment though. Perhaps this is what happened at CD. There is an unusual amount of Mg in a number of the local pegmatites so you have the ability to up concentrate much more easily than pegmatites in other localities. I do find the magnesite ID a little bit questionable I but cannot refute what the EDS scan shows as I know that almost anything is possible in micro environments in pegmatites. I feel safe telling you to go with it as magnesite." |
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Species: METASWITZERITE Confidence: 5 Chemistry: Mn+23(PO4)2 · 4H2O Locality: Parker Mtn. Mine, Center Strafford, NH Specimen Size: 8 mm field of view (top photo). Scaly golden-bronze colored metaswitzerite on triphylite Field Collected: Gene Bearss - 1979 Owner: Tom Mortimer Catalog No.: u1786 Analysis: A carbon tape mounted grain EDS analysis (BC36) showed only P, Mn, O and a bit of Fe. Notes: The Bearss label with the specimen suggests metaswitzerite for this mineral. The chemistry indicated by the EDS spectrum is consistant with metaswitzerite with a bit of Fe substitution for some Mn. Mindat photos of metaswitzerite from The Foote Lithium Mine in North Carolina compare favorably with this specimen. |
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Species: NIZAMOFFITE Confidence: 4 Chemistry: Mn+2Zn2(PO4)2(H2O2)4 Locality: Palermo Mine, N. Groton, NH Specimen Size: 3 mm field of view Field Collected - Owner: Bob Wilken Analysis: The nizamoffite identification is suggested by EDS analysis 9/14/16. Notes: The sodium response (not present in the described nizamoffite chemistry) is likely a miss-identification by the EDS element assignment software. Zn and Na have strong peaks separated by only 29 eV. [tm] I question the EDS software assignment of sodium within the Zn-Na peak. Zn has two peaks in this area, one at 1.012 KeV and one at 1.035 KeV. Sodium has a strong peak at 1.041 KeV. The resolution of the instrument is 125 eV (0.125 KeV). |
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Species: NIZAMOFFITE Locality: Palermo Mine, N. Groton, NH Specimen Size: 0.5 mm nizamoffite crystal Field Collected - Owner: Bob Wilken Notes: |
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Species: OVERITE group Confidence: 3 Chemistry: (Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2O Locality: Palermo Mine, N. Groton, NH Specimen Size: 4 mm field of view Field Collected: Forrest Fogg Owner: Tom Mortimer Catalog No.: u1475 Analysis: Qualitative EDS analysis suggests this is likely a member of the overite mineral group, perhaps manganosegelerite Notes: From material collected by Forrest Fogg in the 1970's, forwarded to me by Gordon Jackson. The color is about right based on the mindat photo for this species. No overite group minerals have been reported from Palermo. A quantitative EDS with Atomic %'s and good light element resolution would be helpful on this specimen. |
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