Dolomite gallery

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DOLOMITE Pond Hill, Lisbon, NH Pair of 1.5 mm dolomite rhombs in talc-like matrix.	Species: DOLOMITE Locality: Pond Hill, Lisbon, NH Specimen Size: Pair of 1.5 mm dolomite rhombs in talc-like matrix. Field Collected: Bill Ellis 2009 Catalog No.: u904 Notes: Crystals on side of specimen u104.
DOLOMITE Livermore Falls, Campton, NH 7 mm field of view. Milky rhombs of dolomite on quartz to 0.4 mm.	Species: DOLOMITE Locality: Livermore Falls, Campton, NH Specimen Size: 7 mm field of view. Milky rhombs of dolomite on quartz to 0.4 mm. Field Collected: Tom Mortimer Catalog No.: u1118 Notes: Dolomite, CaMg(CO₃)₂ , indicated by EDS analysis . Low element weight Mg peak somewhat attenuated by EDS detector compared to Fe peak. This would likely be ferroan dolomite, bordering on ankerite.
DOLOMITE Livermore Falls, Campton, NH Zoom view of u1118. Milky rhombs of dolomite to 0.4 mm.	Species: DOLOMITE Locality: Livermore Falls, Campton, NH Specimen Size: Zoom view of u1118. Milky rhombs of dolomite to 0.4 mm. Field Collected: Tom Mortimer Catalog No.: u1118 Notes:
DOLOMITE Pike Quarry, Hooksett, NH 0.8 mm pale yellow-tan saddle-shaped dolomite crystals	Species: DOLOMITE Locality: Pike Quarry, Hooksett, NH Specimen Size: 0.8 mm pale yellow-tan saddle-shaped dolomite crystals Field Collected: Tom Mortimer - 10/25/14 Catalog No.: u1783 Notes: A raw crystal on carbon tape EDS analysis (BC24) indicated a Ca, Mg carbonate with minor Fe & Mn. This EDS spectrum suffers from low counts and insufficient averaging. I had difficulty photographing these.
DOLOMITE Pond Hill, Lisbon, NH 4 cm specimen with honey-colored dolomite rhombs in talc-like matrix	Species: DOLOMITE Locality: Pond Hill, Lisbon, NH Specimen Size: 4 cm specimen with honey-colored dolomite rhombs in talc-like matrix Field Collected: Bill Ellis Catalog No.: u904 Notes: Dolomite, CaMg(CO3)2 identification by EDS analysis: Mg (1.24) = 454; Ca (3.69) = 591; Fe (6.40) = 65; Background 2KeV/10KeV = 36/3. These were collected from ledge, not glacial float.
DOLOMITE - FERROAN Westmoreland Crushed Stone Quarry, Westmoreland, NH 2.5 cm specimen with 6 mm ferroan dolomite crystals on side of milky quartz crystal	Species: DOLOMITE - FERROAN Locality: Westmoreland Crushed Stone Quarry, Westmoreland, NH Specimen Size: 2.5 cm specimen with 6 mm ferroan dolomite crystals on side of milky quartz crystal Field Collected: Tom Mortimer Catalog No.: 673 Notes:
DOLOMITE - FERROAN Westmoreland Crushed Stone Quarry, Westmoreland, NH 10 cm specimen with ferroan dolomite crystals to 1 cm	Species: DOLOMITE - FERROAN Locality: Westmoreland Crushed Stone Quarry, Westmoreland, NH Specimen Size: 10 cm specimen with ferroan dolomite crystals to 1 cm Field Collected: Tom Mortimer Catalog No.: 791 Notes:
DOLOMITE - FERROAN Crushed Stone Quarry, Westmoreland, NH 1.7 cm specimen	Species: DOLOMITE - FERROAN Locality: Crushed Stone Quarry, Westmoreland, NH Specimen Size: 1.7 cm specimen Field Collected: Tom Mortimer Catalog No.: 532 Notes: Rhombic fracture cleavage clearly evident.
DOLOMITE - FERROAN Mine Falls Park, Nashua, NH Broken 3.5 cm tan rhombic siderite crystal cross-section, with limonite rind, embedded in sphalerite	Species: DOLOMITE - FERROAN Locality: Mine Falls Park, Nashua, NH Specimen Size: Broken 3.5 cm tan rhombic ferroan dolomite crystal cross-section, with limonite rind, embedded in sphalerite. Field Collected: Tom Mortimer Catalog No.: Notes: Specimen backside is mostly galena. Ankerite was initially suggested by EDS analysis . A 2018 quantitative EDS analysis (BC278) indicated insufficient iron (Fe) for this to be ankerite. The indicated chemistry from this analysis was Ca(Mg_0.51, Fe_0.23, Mn_0.07)O₆ , normalized for one atom of Ca. The carbon was not quantified. Thus, Mg dominant over Fe and therefore ferroan dolomite.
DOLOMITE Johnson Rd., Bow, NH 1.5 cm field of view	Species: DOLOMITE Locality: Johnson Rd., Bow, NH Specimen Size: 1.5 cm field of view Field Collected: 2016 Catalog No.: 2070 Notes: A few tiny calcite crystals are sprinkled on the curved, rhombic, dolomite crystals. This could be ankerite, but recent studies have shown that most "ankerite" is ferroan dolomite.
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