DRAVITE    Gallery                       Return to Dravite page.                  Click on image for larger view
Much of the black tourmaline in the western part of New Hampshire has been analyzed to be the Dravite species.
Highslide JS
DRAVITE    Wheeler Mtn., Winchester, NH
1.7 cm nearly equant dravite crystal.

Species:           DRAVITE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 1.7 cm nearly equant dravite crystal.
Field Collected: Tom Mortimer
Catalog No.: 540
Notes: Ideal dravite chemistry is: NaMg3Al6(BO3)3(Si6O18)(OH)4
Dravite indicated by 2006 Bart Cannon qualitative EDS analysis.
These Wheeler Mtn. dravite crystals were collected from an approximate one cubic meter milky quartz pod. These remarkably well formed dravite crystals were very difficult to expose from the quartz matrix and many were broken for those that survived whole.
An October 2018 polished grain quantitative EDS analysis (BC310) gave an APFU from the tabulated element atomic percents as: Na0.98Ca0.27Mg3.0Fe2.78Al16.74Si15.99O31.39 , normalized for 3 Mg. The Al and Si values are very high, but the ratios of Mg to Fe indicate this is magnesium dominant, suggesting a dravite identification.
Highslide JS
DRAVITE    Wheeler Mtn., Winchester, NH
2.2 cm group of three penetrating dravite crystals.

Species:           DRAVITE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 2.2 cm group of three penetrating dravite crystals.
Field Collected: Tom Mortimer
Catalog No.: 521
Notes:
Highslide JS
DRAVITE    Wheeler Mtn., Winchester, NH
5.3 cm specimen with 2 cm stubby, double terminated, dravite crystal in iron stained quartz.

Species:           DRAVITE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 5.3 cm specimen with 2 cm stubby, double terminated, dravite crystal in iron stained quartz.
Field Collected: Tom Mortimer
Catalog No.: 608
Notes:
Highslide JS
DRAVITE    Wheeler Mtn., Winchester, NH
2.5 cm specimen with 1.4 cm stubby dravite crystal in quartz.

Species:           DRAVITE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 2.5 cm specimen with 1.4 cm stubby dravite crystal in quartz.
Field Collected: Tom Mortimer
Catalog No.: 563
Notes:
Highslide JS
DRAVITE    Wheeler Mtn., Winchester, NH
1.2 cm specimen stubby, double terminated, dravite crystal on balsa pedistal.

Species:           DRAVITE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 1.2 cm specimen stubby, double terminated, dravite crystal on balsa pedistal.
Field Collected: Tom Mortimer
Catalog No.: 562
Notes: This crystal nicely illustrates the hemimorphic form of dravite crystals.
Highslide JS
DRAVITE    Wheeler Mtn., Winchester, NH
1.4 cm field of view. Interior of broken dravite crystal with cavity of brown dravite fibers.

Species:           DRAVITE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 1.4 cm field of view. Interior of broken dravite crystal with cavity of brown dravite fibers.
Field Collected: Tom Mortimer
Catalog No.: 559
Notes:
Highslide JS
DRAVITE    Wheeler Mtn., Winchester, NH
6 cm specimen with 2 cm stubby, double terminated, dravite crystal.

Species:           DRAVITE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 6 cm specimen with 2 cm stubby, double terminated, dravite crystal.
Field Collected: Tom Mortimer
Catalog No.: 725
Notes:
Highslide JS
DRAVITE    Wheeler Mtn., Winchester, NH
2.7 cm specimen with 1.5 cm stubby, terminated, dravite crystal.

Species:           DRAVITE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 2.7 cm specimen with 1.5 cm stubby, terminated, dravite crystal.
Field Collected: Tom Mortimer
Catalog No.: 723
Notes:
Highslide JS
DRAVITE    Wheeler Mtn., Winchester, NH
3 cm specimen with 2.1 cm stubby, terminated, dravite crystal in feldspar.

Species:           DRAVITE
Locality:          Wheeler Mtn., Winchester, NH
Specimen Size: 3 cm specimen with 2.1 cm stubby, terminated, dravite crystal in feldspar.
Field Collected: Tom Mortimer
Catalog No.: 724
Notes:
Highslide JS
DRAVITE    Canterbury Soapstone Quarry, Canterbury, NH
3.2 cm specimen height. Brown dravite tourmaline on quartz.


Highslide JS
DRAVITE    Canterbury Soapstone Quarry, Canterbury, NH
7 mm zoom view, shows brown color
Species:           DRAVITE  
Locality:          Canterbury Soapstone Quarry, Canterbury, NH
Specimen Size: 3.2 cm specimen height. Brown dravite tourmaline on quartz. 7 mm zoom view shows brown color.
Field Collected: Tom Mortimer 2013
Catalog No.: 1882
Notes: From quartz outcrop near highway.
EDS analysis indicated the Mg rich tourmaline dravite. The analyst stated, the EDS "detector detects Al better than Si so Iíll buy Dravite."
Highslide JS
DRAVITE    Vacinity of Soapstone Quarry, Richmond, NH
5 cm crude complete crystal
Species:           DRAVITE   NaMg3Al6(BO3)3(Si6O18)(OH)4
Locality:          Vacinity of Soapstone Quarry, Richmond, NH
Specimen Size: 5 cm crude complete crystal
Field Collected: Tom Mortimer - June 1977
Catalog No.: 1550
Notes: Collected from a pegmatite dike with Mike Undercofler. I was never able to find this dike again dispite several attempts. Dravite was indicated by a Canon Microprobe EDS analysis . Note the analysis plot shows Mg > Fe suggesting the magnesium dominant tourmaline dravite.
An October 2018 polished grain quantitative EDS analysis (BC309) gave an APFU from the tabulated element atomic percents as: Na0.23Ca0.34Mg3.0Fe3.82Al25.9Si27.58O22.5 , normalized for 3 Mg. The Al and Si values are very high, but the ratios of Mg to Fe indicate this is iron dominant, suggesting a schorl-dravite identification.
These two EDS analyses illustrate the risks in reading too much into the relative peaks of an EDS plot result. The EDS detector used for the 2018 analysis has a superior light element detection ability over the 2006 analysis instrument.
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