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Photos recently added to NH species galleries. | |
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Species: GEDRITE Locality: Rt. 16 construction site, Bartlett NH Specimen Size: 6.5 cm specimen Field Collected: Tom Mortimer (2008) Catalog No.: 1653 Notes: Identification by EDS analysis: Na (1.04 KeV) = 57; Mg (1.24) = 425; Al (1.49) = 602; Si (1.74) = 1641; Mn (5.90) = 43; Fe (6.40) = 357; Background 2KeV/10KeV = 51/9 Analyst stated: "Amphibole with Si/Al ~ 6/2. Negligable Alkalis. Mg dominant." "My best guess is an intermediate GEDRITE-CUMMINGTONITE on the Gedrite side of things." [tm notes] Cummingtonite contains no aluminum and this specimen showed a moderate aluminum content. Gedrite: [Mg2][Mg3Al2][(OH)2|Al2Si6O22] Cummingtonite: Mg7Si8O22(OH)2 Gedrite normalized Si:Mg ratio: (6:5) => 1 : 0.83 Cummingtonite normalized Si:Mg ratio: (8:7) => 1 : 0.86 This specimen normalized Si:Mg ratio: 1 : 0.76 (with approximated correction for EDS detector low element response and for Xray relative spectral emission efficiencies.) |
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Species: GRAPHITE Locality: Bristol Graphite Mine, Bristol, NH Specimen Size: 5 cm specimen, massive graphite in iron-stained quartz Field Collected: Bob Wilken (2011) Catalog No.: 1802 Notes: |
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Species: MAGNETITE Locality: Ham-Weeks Mine, Wakefield, NH Specimen Size: 4 cm specimen of massive magnetite with some orange limonite crust Field Collected: Gene Bearss Catalog No.: 1801 Notes: A voucher specimen for the occurrence of magnetite at the Ham-Weeks Mine. |
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Species: URANINITE Locality: Beryl Mtn., South access road, Acworth, NH Specimen Size: 2.2 cm specimen of sub-hedral uraninite crystals embedded in orange feldspar Field Collected: Fred Davis (2011) Catalog No.: 1794 Notes: |
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Species: MELANTERITE Locality: Pike Wilton Quarry (Quinn Brothers Quarry), Wilton, NH Specimen Size: 4 cm specimen of yellow melanterine crust Field Collected: Scott Rielly (2011) Catalog No.: 1810 Notes: Identification - Yellow crust desolves in water. Found on ledge underside in zone of weathering pyrite. The yellow crust is very fragile. |
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Species: ROCKBRIDGEITE Locality: Valencia Mine, N. Groton, NH Specimen Size: 1.5 cm field of view. Black, botryoidal, rockbridgeite Field Collected: Tom Mortimer Catalog No.: 1811 Notes: |
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Species: PYRITE Locality: Indian Stream, Pittsburg, NH Specimen Size: 2 cm pyrite cube with minor phyllite on surface Field Collected: A purchased specimen (1992) Catalog No.: 1098 Notes: |
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Species: LEUCOPHOSPHITE Locality: Palermo Mine, N. Groton, NH Specimen Size: 0.5 mm leucophosphite crystal group Field Collected: Walter Lane Catalog No.: u1205 Notes: This specimen has replaced the former display case specimen. |
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Species: LEUCOPHOSPHITE Locality: Palermo Mine, N. Groton, NH Specimen Size: 0.4 mm leucophosphite crystal group Field Collected: Walter Lane Catalog No.: u1205 - another crystal group from the main page specimen Notes: |