Locality: Fletcher Mine, N. Groton, NH
Specimen Size: 4 mm field of view. Yellow crystaline matrix is the jahnsite-(CaMnMn).
Field Collected: Clayton Ford, 1960's. Acquired by Gordon Jackson 9/22/03. Gifted to T. Mortimer 3/19/16.
Catalog No.: u1956
Notes: Pale yellow jahnsite-(CaMnMn) with lavender strengite ball and stubby black prisms of rockbridgeite
A polished grain EDS analysis (BC82) indicated a Mn > Fe, Ca, phosphate with a Mn:Fe:Ca:P ratio of about 2.5:1.8:1.1:4 An XRD analysis was attempted on this mineral, but the sample was to small to produce a useful result.
Additional EDS analyses (BC383, A) gave chemistries of (normalized for 4 P):
Ca0.88Mn1.7Fe1.09Al0.44P4F0.49O50
Ca0.84Mn1.73Fe1.04Al0.39P4F0.73O50
Jahnsite-(CaMnMn), {Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2·8H2O comes closest to this chemistry.
I have struggled to get a satisfactory identification for this specimen. The aluminum and fluorine observed in the analyses are a bit bothersome. Several mindat.org photos of jahnsite-(CaMnMn) compare favorably with this Fletcher specimen.
Locality: Water Pocket Locality, Albany, NH
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.
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.
Locality: Charles Davis Mine, N. Groton, NH
Specimen Size: 5 mm field of view
Field Collected: Janet Cares ? (ex. Janet Cares specimen)
Catalog No.: u2296
Notes: Acquired from MMNE silent auction, Jan., 2010.
The pale-green crystals associated with the deep blue scorzalite at the Charles Davis Mine have been previously analyzed to be magnesium dominant (over iron). But an EDS analysis with quantification has been lacking. An EDS analyses (BC382) from a green grain from this specimen clearly showed Mg >> Fe, so lazulite.
Lazulite chemistry is: (Mg,Fe2+)Al2(PO4)2(OH)2
The chemistry calculated from this analysis is: (Mg0.85,Fe0.16)Σ1.01Al2.1(PO4)2O24 ,
normalized for two P. This is a very satisfying analysis with Mg + Fe essentially one, and both Al and P equal to two. As typical with our BC analyses, the oxygen is substantially over-stated.
Locality: Charles Davis Mine, N. Groton, NH
Specimen Size: 9 mm field of view
Field Collected: Janet Cares ? (ex. Janet Cares specimen)
Catalog No.: u2296
Notes: Another view from u2296.
Locality: Charles Davis Mine, N. Groton, NH
Specimen Size: 1.2 mm scorzalite crystal
Field Collected: Janet Cares ? (ex. Janet Cares specimen)
Catalog No.: u2296
Notes: A scorzalite crystal on u2296.
Locality: Aggregate Industries Quarry, Raymond, NH
Specimen Size: 4 mm field of view
Field Collected: Tom Mortimer
Catalog No.: u2297
Notes: My initial visual identification of these octahedrons was galena. A January, 2020 polished grain EDS analysis (BC374) indicated pyrite. A thin coating of some other mineral is suspected to be responsible for the silver gray appearance. The clear, flat-blade, sprays are gypsum.
Locality: Aggregate Industries Quarry, Raymond, NH
Specimen Size: 0.5 mm pyrite crystal
Field Collected: Tom Mortimer
Catalog No.: u2297
Notes: The clear, flat-blade, sprays are gypsum.
Locality: Madison Lead Mine, Madison, NH
Specimen Size: 3 mm field of view
Field Collected: Tom Mortimer - 8/04
Catalog No.: u1272
Notes: White lumpy balls of smithsonite with sphalerite. Sphalerite crystal, pale-yellow, is center-left. Partly visible brown crystal upper-right is also sphalerite. The sphalerite is fluorescent rose-red, SW UV. The smithsonite is not fluorescent.
Smithsonite indicated by EDS analyses (BC372). Minor amounts of Ca and Mn have been reported in some smithsonite analysis
Locality: Holt's Prospect, Cambridge, NH
Specimen Size: 2.5 cm across specimen
Field Collected: Cliff Trebelcock
Catalog No.: 2124
Notes: Dark green diopside is associated with the light green epidote and quartz at the Cambridge prospect. I [tm] had some hope that this might be hedenbergite, the Fe member of the Mg-Fe diopside-hedenbergite series, (a NH species I am looking for), but EDS analyses (BC378) showed this is diopside.
This is a low-effort voucher photo.
Locality: Chickering Mine, Walpole, NH
Specimen Size: 10 mm field of view
Field Collected: Tom Mortimer
Catalog No.: u2298
Notes: Dark green-black massive wyllieite group mineral. The wyllieite group species qingheiite is reported from the Chandlers Mill Mine in Newport, NH.
Prior to analysis, I thought this might be a compact form of frondelite, recently identified from the Chickering Mine.
Two polished grain EDS analyses computed a chemistry of: (normalized for 3 P)
Na1.4Fe0.84Mn0.19Mg0.75Ca0.16K0.12Al0.25P3O23
Na1.66Fe1.23Mn0.18Mg0.50Ca0.22K0.10Al0.26P3O36
This is a phosphate with dominant Na, Fe, and Mg cations. From the wyllieite group members, (tabulated below the specimen photo), it is seen that Ca. Fe, Mn, Mg can be distributed across multiple sites.