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Highslide JS
DIOPSIDE   Wheeler Mtn., Winchester, NH  
3 cm specimen with prism of iron-stained diopside.

Species:           DIOPSIDE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 3 cm specimen with prism of iron-stained diopside.
Field Collected: Tom Mortimer (1994)
Catalog No.: 1813
Notes: Although their color is somewhat similar to the epidote that is common at this locality, when viewed down the prism axis these crystals appear square to rectangular, quite different than the epidote. I had set these aside for about fifteen years. When I viewed them again recently, I thought they might be hedenbergite. The EDS analysis result that came back in Jan. 2012 indicated they were clearly on the diopside end of the diopside - hedenbergite series, (Mg:Fe about 2:1). These diopside crystals are the largest New Hampshire examples the author has seen.
Highslide JS
DIOPSIDE   Wheeler Mtn., Winchester, NH  
Central (terminated) diopside crystal is 1.0 cm

Species:           DIOPSIDE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: Central (terminated) diopside crystal is 1.0 cm
Field Collected: Tom Mortimer (1994)
Catalog No.: 1812
Notes: The EDS analysis sample was taken from this specimen.
Highslide JS
DIOPSIDE   Wheeler Mtn., Winchester, NH  
1.6 cm diopside crystal with ferrohornblende inclusions.

Species:           DIOPSIDE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 1.6 cm diopside crystal with ferrohornblende inclusions.
Field Collected: Tom Mortimer (1994)
Catalog No.: 879
Notes: Terminations on most of these Wheeler Mtn. diopside crystals are crude. Many of the crystals collected contained numerous blades of dark-green ferrohornblende. Very pale lemon-yellow titanite crystals are a frequent association with this diopside. The Wheeler Mtn. locality is at a contact between the Amoonusic Volcanics and a granite body to the west.
Highslide JS
DIOPSIDE   Wheeler Mtn., Winchester, NH  
2.5 cm field of view. Parallel group of diopside crystals.

Species:           DIOPSIDE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 2.5 cm field of view. Parallel group of diopside crystals.
Field Collected: Tom Mortimer (1994)
Catalog No.: 1814
Notes:
Highslide JS
DIOPSIDE   Wheeler Mtn., Winchester, NH  
1.4 cm terminated diopside crystal.

Species:           DIOPSIDE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 1.4 cm terminated diopside crystal.
Field Collected: Tom Mortimer (1994)
Catalog No.: 1815
Notes: This crystal has been cleaned in Iron Out.
Highslide JS
DIOPSIDE   Wheeler Mtn., Winchester, NH  
1.5 cm diopside crystal, very crude termination.

Species:           DIOPSIDE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 1.5 cm diopside crystal, very crude termination. Some ferrohornblende inclusions.
Field Collected: Tom Mortimer (1994)
Catalog No.:
Notes: This crystal has been cleaned in Iron Out.
Highslide JS
DIOPSIDE   Wheeler Mtn., Winchester, NH  
1.6 cm diopside crystal, with minor feldspar.

Species:           DIOPSIDE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 1.6 cm diopside crystal, with minor feldspar.
Field Collected: Tom Mortimer (1994)
Catalog No.: 1816
Notes: This crystal has been cleaned in Iron Out. Lighter green on top surface is epidote.
Highslide JS
DIOPSIDE   Wheeler Mtn., Winchester, NH  
1.6 cm diopside crystal section

Species:           DIOPSIDE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 1.6 cm diopside crystal section
Field Collected: Tom Mortimer (1994)
Catalog No.: 1816 - another view
Notes: This crystal has been cleaned in Iron Out.
Highslide JS
DIOPSIDE - HEDENBERGITE    Merrimack Skate 3 parking lot ledge, Merrimack, NH
Dark green diopside - hedenbergite with pale green epidote in quartz matrix
Species:           DIOPSIDE - HEDENBERGITE  
Locality:          Merrimack Skate 3 parking lot ledge, Merrimack, NH
Specimen Size: 4 cm specimen. Dark green diopside - hedenbergite with pale green epidote in quartz matrix
Field Collected: Tom Mortimer, Sept. 2010
Catalog No.: 1963
Notes: EDS analyzed A complete series of compositions exits between diopside and hedenbergite.
Hedenbergite: CaFe2+Si2O6
Diopside: CaMgSi2O6
The EDS spectrum suggests an excess of Mg over Fe, (favoring a diopside ID) however the computed element atomic percents indicate an excess of Fe over Mg. However, when the EDS analysis atomic%'s are converted to APFU, I get (normalized to two silicon atoms):
Ca1.12(Mg0.51,Fe0.31)Si2O4.4 . So clearly Mg (diopside) dominant.
A Raman analysis reported: "The Merrimack samples gave epidote for the light green and a good match (97%) for diopside for the single grain [of the dark green].... Raman probably can be calibrated for diopside-hedenbergite, but we'd want to have spectra at all the same laser wavelength (and [the] laser [used here] at 633 nm isn't one that the rruff database uses."
An October, 2015 XRD analysis confirmed the dominant species to be diopside.