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Highslide JS
PREHNITE    Pulpit Rock area, Pelham, NH
3 cm specimen of tabular, white, prehnite crystals

Species:           PREHNITE
Locality:          Pulpit Rock area, Pelham, NH
Specimen Size: 3 cm specimen of tabular, white, prehnite crystals
Field Collected: Peter Cristofono, 2010
Catalog No.: 1777
Notes:
Highslide JS
PREHNITE    Merrimack Industrial Interchange, Merrimack, NH
7.5 cm specimen with 2 cm zone of pale green prehnite in basalt vug

Species:           PREHNITE
Locality:          Merrimack Industrial Interchange, Merrimack, NH
Specimen Size: 7.5 cm specimen with 2 cm zone of pale green prehnite in basalt vug
Field Collected: Tom Mortimer
Catalog No.: 794
Notes:
Highslide JS
PREHNITE    Rt. 101 - 101A road cut, Amherst, NH
7 cm specimen with glassy pale-green prehnite crystals.

Species:           PREHNITE
Locality:          Rt. 101 - 101A road cut, Amherst, NH
Specimen Size: 7 cm specimen with glassy pale-green prehnite crystals.
Field Collected: Tom Mortimer (Aug 1997)
Catalog No.: 1029
Notes:
Highslide JS
PREHNITE  Rt. 101 - 101A Road Cut, Amherst, NH
1.8 mm prehnite bow-tie with tiny pyrite crystals and babingtonite
Species:           PREHNITE
Locality:          Rt. 101 - 101A Road Cut, Amherst, NH
Specimen Size: 1.8 mm prehnite bow-tie with tiny pyrite crystals and babingtonite
Field Collected: Tom Mortimer
Catalog No.: u327
Notes:
Highslide JS
PREHNITE   Rt. 101 - 101A road cut, Amherst, NH
1.8 mm prehnite fan

Species:           PREHNITE
Locality:          Rt. 101 - 101A road cut, Amherst, NH
Specimen Size: 1.8 mm prehnite fan
Field Collected: Tom Mortimer, Aug. 1997
Catalog No.: u327
Notes: I have difficulty photo-ing these bright-white, lustrous, prehnite clusters. Increasing the light just washes everything out.
Photo from a 66 image stack with Canon T3i, EFS 55-250 lens, plus B&L objective lens, processed with Helicon Focus Method B.
Highslide JS
PREHNITE   Mine Falls Park, Nashua, NH
5 mm field of view

Species:           PREHNITE     Ca2Al2Si3O12(OH)
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 5 mm field of view
Field Collected: Tom Mortimer
Catalog No.: p/o u279
Notes: These tabular prehnite crystals were found in calcite filled seams. Sharp, clean, crystals are exposed by dissolving the calcite with vinegar or muriatic acid.
Highslide JS
PREHNITE   Mine Falls Park, Nashua, NH
5 mm field of view. Stilbite crystal protruding from top

Species:           PREHNITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 5 mm field of view. Stilbite crystal protruding from top.
Field Collected: Tom Mortimer
Catalog No.: p/o 1062
Notes:
Highslide JS
PREHNITE ?   Pike Quarry, Hooksett, NH
2 mm string of milky rhombic crystals.
Species:           PREHNITE ?  
Locality:          Pike Quarry, Hooksett, NH
Specimen Size: 2 mm string of milky rhombic crystals.
Field Collected: Tom Mortimer - 2014
Catalog No.: NC
Notes: First thought was that these were calcite, but gave NO fizz in muriatic acid. Given presence in basalt amygdule void, chabazite is good guess....but a Bob Wilken reminded me chabazite will slowly decompose to a gel in HCl. No decomposition was observed after several hours. The remaining prime candidate would seem to be prehnite.
Highslide JS
PREHNITE ?   Pike Quarry, Hooksett, NH
0.5 mm cluster of milky rhombic crystals..
Species:           PREHNITE ?  
Locality:          Pike Quarry, Hooksett, NH
Specimen Size: 0.5 mm cluster of milky rhombic crystals.
Field Collected: Tom Mortimer - 2014
Catalog No.: u1481
Notes: