Locality: Hurricane Mtn., Conway, NH
Specimen Size: 2.4 cm terminated arfvedsonite crystal
Field Collected: Attributed to Ernie Schlichter - Peter Samuelson joint diggings
Catalog No.: 1749
Notes:
Locality: Hurricane Mtn., Conway, NH
Specimen Size: 4.2 cm arfvedsonite crystal in matrix
Field Collected: Tom Mortimer
Catalog No.: 842
Notes: A polished grain EDS analysis gave a result that was very low in sodium and high in iron for the species.
A second EDS analysis of of this same grain by Al Falster of the MMGM lab (without quantification) also suggested a high Fe content. Al's analysis showed moderate substitution of Mn, Mg, Al, Ca, and Ti.
The RUFF web site provides a complex empirical chemistry for the arfvedsonite species:
(Na0.61K0.39)Na2.00(Fe2+2.40Mg0.80Mn0.75Ca0.05)4(Fe3+0.60Al0.25Mn0.15)(Si7.99Ti0.01)8O22((OH)0.67F0.33)2
indicating the substitution elements present in Al's analysis.
Locality: Hurricane Mtn., Conway, NH
Specimen Size: 2 mm crystal blade
Field Collected: Leroy Grant - early 1970's
Catalog No.: u2223
Notes: Top photo: blade crystal in vug, termination partially obscured. 70 stacked images with Nikon objective. Helicon Method C.
Lower photo: 26 stacked images with B&L 5X objective - different orientation. Helicon Method C - a bit grainy.
Locality: Hurricane Mtn, Conway, NH
Specimen Size: 5 mm field of view
Field Collected: Found in large box of uncleaned, untrimmed, Hurricane Mtn. specimens collected by Leroy Grant of Albany, NH (deceased). Collected in the 1970's.
Catalog No.: 2107
Notes: Matrix is small crystals of microcline-albite. Some tiny clear quartz crystals are also present. I considered aegirine, however it has not been reported from Hurricane Mtn. I have not previously seen a similar green, bladed, species from Hurricane.
Philip Morrill (1960) reports "Acmite" = aegirine from Red Hill in Moultonboro. Janet Cares includes aegirine in her Vol. 65, no. 4, Rocks & Minerals NH species list (pg.298), likely using Morrill's reference. Finally, Morrill's source is likely T. R. Meyers New Hampshire Minerals and Mines 1941, pg. 30. I have never seen a NH aegerine. It is remarkable how these references propagate without a demonstrable specimen!
A January 2019 polished grain EDS analysis (BC313) indicated a chemistry of NaFe1.78Si4.45O0.65 , normalized for 1 Na, (or Na3Fe5.34Si13.35O1.95 normalized for 3 Na). The oxygen value is very low for any pyroxene or amphibole. Aegirine chemistry is NaFeSi2O6 .
Candidate species that are visually and chemically close include:
Riebeckite [ ]Na2(Fe2+3Fe3+2)Si8O22(OH)2 -> Na:Fe:Si = 2:5:8 -> 1:2.5:4
Arfvedsonite NaNa2(Fe2+4Fe3+)Si8O22(OH)2 -> Na:Fe:Si = 3:5:8 -> 1:1.7:2.7
Wilkinsonite Na4(Fe2+8Fe3+4)O4[Si12O36] -> Na:Fe:Si = 1:3:3
Howieite Na(Fe2+,Fe3+,Al,Mg)12(Si6O17)2(O,OH)10 -> Na:Fe:Si = 1:12:12
A side-by-side EDS of Hurricane Arfvedsonite and this specimen would be helpful. The BC313 indicates Arfvedsonite is the "best fit". I [tm] have not seen the greenish color on arfvedsonite before.
Note added 8/22: In the spring of 2022, Bob Wilken EDS confirmed aegirine at Hurricane Mtn. See Aegirine .
Locality: Hurricane Mtn, Conway, NH
Specimen Size: 3.8 cm crystal
Field Collected: Bob Eastman. A former Ernie Schlichter specimen.
Catalog No.: 3110. A Don Dallaire specimen & photo.
Notes:
Locality: Hurricane Mtn, Conway, NH
Specimen Size: 4.25 cm crystal
Field Collected: Peter Samuelson A former Bob Whitmore specimen.
Catalog No.: 4013. A Don Dallaire specimen & photo.
Notes:
Locality: Hurricane Mtn., Conway, NH
Specimen Size: 1.54 mm crystal in center
Field Collected: Bob Wilken - 9/21
Catalog No.: A Bob Wilken specimen & photo. HUR-Arfvedsonite01A
Notes: Taken with EPO objective; 86 photos in the stack with 22 um steps.
Locality: Huricane Mtn., Conway, NH
Specimen Size: 1.2 cm tall arfvedsonite crystal on microcline crystal matrix with zircons.
Field Collected: Roger Eastman
Catalog No.: A Don Dallaire specimen and photo. Acquired 8/22.
Locality: Hurricane Mtn. Conway, NH
Specimen Size: 11 cm crystal
Field Collected: Label says "A gift from M. Chandler"
Catalog No.: Harvard Mineral Museum #119209.
Notes: A Kevin Czaja photo.