Locality: Chandlers Mill Mine, Newport, NH
Specimen Size: 5 cm specimen. Dark-blue lazulite zone in lower part of specimen is 1.2 cm.
Field Collected: Tom Mortimer
Catalog No.: 1844
Notes: Lazulite is rare in New Hampshire. Most specimens labeled "lazulite" are actually scorzalite, the iron rich end member of the lazulite-scorzalite series. Lazulite in this Chandlers Mill specimen was confirmed by EDS analysis (The actual Mg content is higher than the plot would suggest because the response of this EDS detector is low for lighter elements)
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.
A 2023 Raman analysis also agreed with the lazulite identification. The black traces are from the u2296 sample, the colored traces are from the RUFF reference data base.
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.