Locality: Stoney Mtn. Winchester, NH
Specimen Size: 6 cm plate of dravite crystals.
Field Collected: Tom Mortimer
Catalog No.: 1623
Notes: A visual identification. Examination under microscope reveals this tourmaline is a very dark, glassy, brown.
Locality: Island Mine, Alstead, NH
Specimen Size: A 6.5 cm specimen with pair of terminated dravite crystals in coarse mica matrix
Field Collected: Tom Mortimer
Catalog No.: NC
Notes: A difficult specimen to photograph with black lustrous dravite and bright reflective mica.
Locality: Bradsher Quarry, Rt 11, Farmington, NH
Specimen Size: 1.5 mm field of view
Field Collected: Peter Cristofono
Catalog No.: A Peter Cristofono specimen and photograph.
Notes:
Locality: Winham Mine, Marlow, NH
Specimen Size: 6 mm field of view
Field Collected: Tom Mortimer 8/18
Catalog No.: u2215
Notes: Collected from coarse-grained pegmatite boulder. Chemical composition computed from atomic percent EDS analysis (BC304) gave: NaMg0.67Ca0.06K0.06Al5.14Fe0.09Si4.13O44.34 (normalized for one atom of sodium) indicating the magnesium dominant tourmaline species dravite. Yes, the Mg + Ca + K total is low for dravite.
Locality: Joppa Hill, Amherst, NH
Specimen Size: 9 mm brown tourmaline crystal
Field Collected: Tom Mortimer - 4/21
Catalog No.: u2493
Notes: From coarse mica boulder in cleared residential construction lot.
An EDS analysis (low count, BC358, set 28) indicated a magnesium dominant tourmaline. The EDS software did not tag the Na (1.04 KeV) and Fe (6.40 KeV) peaks.
A second (high count, BC350 - set 31) EDS analysis also supported a dravite identification. A moderate Fe (schorl) component was present.
Locality: Vacinity of Purgatory Falls, Mt. Vernon, NH
Specimen Size: 2 cm field of view
Field Collected: Tom Mortimer - 1991
Catalog No.: NC
Notes: Dravite is a visual ID, based on dark brown color and analyzed dravite specimens from other near-by Hillsboro County specimens. Matrix is mica schist.