Mine Falls, Nashua, NH, Mineral Gallery                   Return to mindatnh front page.                Click on image for larger view
This page is an alphabetical photo gallery of minerals from the Mine Falls Park locality, Nashua, New Hampshire.   (A locality specific photo set from mindatnh.org) 16 species, 39 mineral photos, 2 locality photos, 2 mineral analyses.
These mineral photos are an update to the Rocks & Minerals article Sept/Oct 1990, Vol 65 No.5, pgs. 433-437, "Recent Mineral Discoveries at Mine Falls Park" by Scott Whittemore. This article provides an excellent overview of the history of this old locality.
Per the Mine Falls Park web page (2013), "Visitors enjoy numerous passive recreation opportunities." The request on this web page: "Don't ...Damage or deface signs or structures, such as bridges, rocks, etc." is hopefully directed at graffiti vandals and not intended to prohibit the acquisition of a few mineral samples by the hobbyist collector. The Nashua Parks and Recreation Dept. provides a Trail Map for Mine Falls Park.
For the photos below, the species chemistry is included with the first example of each mineral.
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MINE FALLS LOCALITY - Google image

MINE FALLS LOCALITY - Google image
Mine Falls Park, Nashua, NH

Notes: View of Mine Falls hydro-electric station looking upstream. Blasting in 1983-4 for the hydrostation and river bed channel exposed the minerals found at this locality. The lowering of the river bed enabled the ledge seen on the right side of the photo to be available for mineral prospecting.
Highslide JS
MINE FALLS LOCALITY - annotated

MINE FALLS LOCALITY - annotated
Mine Falls Park, Nashua, NH

Annotation:
  RED : This vertical (approx 20 ft.) ledge zone hosted a one to two inch wide vein of arsenopyrite in white quartz. Some zones of this vein were solid arsenopyrite, as shown by the 12 pound slab below. No evidence remains of this vein today.
  BLUE : This verticle zone dipping into the river channel was the location where most zeolite minerals, carbonate minerals, and prehnite were found. None of these minerals were found after the deepened channel was flooded.
  YELLOW : The phyllite rock ledge contains thin (1 - 2 mm) quartz crystal seams that host micro anatase, brookite (rarely), and chabazite crystals.
  ORANGE : A quartz dyke, 4 to 12 inches wide, traverses the exposed ledge below the dam. Sulfide minerals galena, sphalerite, pyrrhotite, and pyrite were found in this dyke. A one foot diameter pocket containing quartz crystals was opened on the "island side" of the vein, lower left.
  WHITE : The west side of the river bed ledge may be accessed via a path originating between two houses on Cheyenne Drive, opposite intersection with Inca Drive. Although unmarked, it is believed this path is a public "right of way."
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ANATASE   Mine Falls Park, Nashua, NH
Pair of deep-blue anatase crystals with quartz crystals. Largest anatase is 1 mm.

Species:           ANATASE    TiO2
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: Pair of deep-blue anatase crystals with quartz crystals. Largest anatase is 1 mm.
Field Collected: Scott Whittemore
Catalog No.:
Notes:
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ANATASE   Mine Falls Park, Nashua, NH
Another pair of deep-blue anatase crystals with quartz crystals. Largest anatase is 1 mm.

Species:           ANATASE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: Another pair of deep-blue anatase crystals with quartz crystals. Largest anatase is 1 mm.
Field Collected: Scott Whittemore
Catalog No.:
Notes:
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ANATASE   Mine Falls Park, Nashua, NH
1 mm anatase crystal

Species:           ANATASE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 1 mm anatase crystal.
Field Collected: Scott Whittemore
Catalog No.:
Notes: It is difficult to avoid some "washed-out" appearance with these dark blue crystals on a bright reflective background.
Highslide JS
ANATASE   Mine Falls Park, Nashua, NH
0.3 mm orange-red anatase crystal on quartz crystals

Species:           ANATASE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 0.3 mm orange-red anatase crystal in quartz crystal seam.
Field Collected: Tom Mortimer
Catalog No.: u555
Notes: This anatase crystal has prominent pinacoid faces.
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ANKERITE   Mine Falls Park, Nashua, NH
Broken 3.5 cm tan rhombic siderite crystal cross-section, with limonite rind, embedded in sphalerite
Species:           ANKERITE     Ca(Fe2+ ,Mg,Mn2+)(CO3)2
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: Broken 3.5 cm tan rhombic ankerite crystal cross-section, with limonite rind, embedded in sphalerite.
Field Collected: Tom Mortimer
Catalog No.:
Notes: Specimen backside is mostly galena.
Ankerite confirmed by EDS analysis
Highslide JS
ARSENOPYRITE   Mine Falls Park, Nashua, NH
8 mm arsenopyrite crystal in quartz
Species:           ARSENOPYRITE     FeAsS
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 8 mm arsenopyrite crystal in quartz
Field Collected: Tom Mortimer
Catalog No.: 655
Notes:
Highslide JS
ARSENOPYRITE   Mine Falls Park, Nashua, NH
4 mm arsenopyrite crystal in quartz-mica matrix
Species:           ARSENOPYRITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 4 mm arsenopyrite crystal in quartz-mica matrix
Field Collected: Tom Mortimer
Catalog No.: U1040
Notes:
Highslide JS
ARSENOPYRITE   Mine Falls Park, Nashua, NH
A 12 inch wide, 20 pound chunk from a large sheet-like vein of arsenopyrite that was exposed at Mine Falls Park during construction of the hydro-electric plant in 1984
Species:           ARSENOPYRITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: A 12 inch wide, 20 pound chunk from a large sheet-like vein of arsenopyrite that was exposed at Mine Falls Park during construction of the hydro-electric plant in 1984.
Field Collected: Tom Mortimer
Catalog No.:
Notes: This chunk is about 80% arsenopyrite, mixed with some quartz and mica. Slickenside surfaces are present on both sides.
Highslide JS
ARSENOPYRITE   Mine Falls Park, Nashua, NH
9 cm specimen with many diamond cross-section voids formally occupied by arsenopyrite crystals.
Species:           ARSENOPYRITE - (casts)
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 9 cm specimen with many diamond cross-section voids formally occupied by arsenopyrite crystals.
Field Collected: Tom Mortimer
Catalog No.: 798
Notes: This specimen is a testimony of the dissolution of arsenopyrite releasing arsenic into the groundwater.
Highslide JS
ARSENOPYRITE   Mine Falls Park, Nashua, NH
7 cm specimen of intergrown steel-gray arsenopyrite crystals with minor mica-quartz.
Species:           ARSENOPYRITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 7 cm specimen of intergrown steel-gray arsenopyrite crystals with minor mica-quartz.
Field Collected: Tom Mortimer
Catalog No.:
Notes: A typical Mine Falls Park arsenopyrite vein rock chunk. After the blasting for the hydrostation out-fall channel, hundreds of pounds of this vein were laying on the channel floor.
Highslide JS
ARSENOPYRITE   Mine Falls Park, Nashua, NH
5 mm arsenopyrite crystal in quartz.
Species:           ARSENOPYRITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 5 mm arsenopyrite crystal in quartz.
Field Collected: Tom Mortimer
Catalog No.: 653
Notes:
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BROOKITE    Mine Falls Park, Nashua, NH
0.5 mm brookite crystal group on quartz crystals.

Species:           BROOKITE     TiO2
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 0.5 mm brookite crystal group on quartz crystals.
Field Collected: A Bob Janules specimen
Catalog No.:
Notes: Brookite is rare at the Mine Falls Park locality.
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CALCITE    Mine Falls Park, Nashua, NH
2 mm calcite crystal in center.

Species:           CALCITE     CaCO3
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 2 mm calcite crystal in center.
Field Collected: Scott Whittemore
Catalog No.: 659
Notes:
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CALCITE    Mine Falls Park, Nashua, NH
4 mm field of view. Calcite scalenohedrons with stilbite.

Species:           CALCITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 4 mm field of view. Calcite scalenohedrons with stilbite.
Field Collected: Scott Whittemore
Catalog No.: 660
Notes:
Highslide JS
CHABAZITE    Mine Falls Park, Nashua, NH
9 mm field of view

Species:           CHABAZITE     K2NaCa0.5(Al4Si8O24) · 11.5H2O
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 9 mm field of view
Field Collected: Scott Whittemore
Catalog No.: u071
Notes:
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CHABAZITE    Mine Falls Park, Nashua, NH
8 mm field of view. Chabazite on stilbite.

Species:           CHABAZITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 8 mm field of view. Chabazite on stilbite.
Field Collected: Scott Whittemore
Catalog No.: u020
Notes:
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GALENA    Mine Falls Park, Nashua, NH
5 mm crystal group in quartz pocket

Species:           GALENA     PbS
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 5 mm crystal group in quartz pocket
Field Collected: Tom Mortimer
Catalog No.: 853
Notes:
Highslide JS
GALENA    Mine Falls Park, Nashua, NH
6.5 cm specimen of galena in milky quartz.

Species:           GALENA
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 6.5 cm specimen of galena in milky quartz.
Field Collected: Tom Mortimer
Catalog No.:
Notes:
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HEULANDITE    Mine Falls Park, Nashua, NH
2.7 mm heulandite crystal

Species:           HEULANDITE     generalized formula    (Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 2.7 mm heulandite crystal
Field Collected: Tom Mortimer
Catalog No.: u1415
Notes: Heulandite is the rarest of the three zeolite species found at Mine Falls Park
Highslide JS
HEULANDITE    Mine Falls Park, Nashua, NH
2.6 mm heulandite crystal

Species:           HEULANDITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 2.6 mm heulandite crystal
Field Collected: Tom Mortimer
Catalog No.: u1415
Notes: The characteristic coffin shape face with pearly luster of heulandite is visible in this view.
Highslide JS
HEULANDITE    Mine Falls Park, Nashua, NH
7 mm complex heulandite crystal

Species:           HEULANDITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 7 mm complex heulandite crystal
Field Collected: Tom Mortimer
Catalog No.: 1062
Notes: The heulandite crystals have little contrast with the surrounding matrix.
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ORTHOCLASE var. Adularia   Mine Falls Park, Nashua, NH
0.3mm orthoclase var. adularia crystals

Species:           ORTHOCLASE var. Adularia     KAlSi3O8
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 0.3mm orthoclase var. adularia crystals
Field Collected: Tom Mortimer
Catalog No.:
Notes: Not an outstanding example of this species for New Hampshire. A voucher photo for this species at Mine Falls Park.
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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
PYRITE   Mine Falls Park, Nashua, NH
3 mm field of view. Tiny pyrite cubes on calcite

Species:           PYRITE     FeS2
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 3 mm field of view. Tiny pyrite cubes on calcite
Field Collected: Tom Mortimer
Catalog No.:
Notes: It is difficult to avoid a few reflections on these tiny, lustrous, cubes.
Highslide JS
PYRITE   Mine Falls Park, Nashua, NH
0.6 mm cubo-octahedral pyrite crystal on oxidized pyrrhotite

Species:           PYRITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 0.6 mm cubo-octahedral pyrite crystal on oxidized pyrrhotite
Field Collected: Bob Janules specimen
Catalog No.: u1337
Notes:
Highslide JS
PYRITE   Mine Falls Park, Nashua, NH
1.8 mm pyrite crystal

Species:           PYRITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 1.8 mm pyrite crystal
Field Collected: Bob Janules
Catalog No.: u1337
Notes:
Highslide JS
PYRRHOTITE   Mine Falls Park, Nashua, NH
4.5 mm pair of co-planer, oxidized, pyrrhotite crystals with small pyrie crystal, top right.

Species:           PYRRHOTITE     Fe1-xS (x = 0 - 0.2)
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 4.5 mm pair of co-planer, oxidized, pyrrhotite crystals with small pyrie crystal, top right.
Field Collected: Bob Janules
Catalog No.: u1337
Notes:
Highslide JS
PYRRHOTITE   Mine Falls Park, Nashua, NH
5 cm specimen of massive pyrrhotite on milky quartz.

Species:           PYRRHOTITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 5 cm specimen of massive pyrrhotite on milky quartz.
Field Collected: Tom Mortimer
Catalog No.: 1464
Notes: Pyrrhotite is slightly magnetic, distinguishing it from pyrite
Highslide JS
PYRRHOTITE   Mine Falls Park, Nashua, NH
3 cm specimen of massive Pyrrhotite

Species:           PYRRHOTITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 3 cm specimen of massive Pyrrhotite
Field Collected: Tom Mortimer
Catalog No.: 1473
Notes:
Highslide JS
QUARTZ   Mine Falls Park, Nashua, NH
7.5 cm specimen

Species:           QUARTZ    SiO2
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 7.5 cm specimen
Field Collected: Tom Mortimer
Catalog No.:
Notes: Some crystals have a bright white quartz over-growth.
Highslide JS
QUARTZ   Mine Falls Park, Nashua, NH
6 cm specimen

Species:           QUARTZ
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 6 cm specimen
Field Collected: Tom Mortimer
Catalog No.: 970
Notes: These quartz crystal clusters came from a basket-ball sized pocket from the "mine island" side of the principal quartz vein. Limonite residue in this pocket indicated that much of the space not occupied by quartz was filled with a sulfide mineral, perhaps pyrrhotite. As New Hampshire quartz specimens go, these are not particularly attractive, but for a southern NH locality, they are relatively large.
Highslide JS
QUARTZ   Mine Falls Park, Nashua, NH
2.6 cm double terminated "floater" quartz crystal from large pocket

Species:           QUARTZ
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 2.6 cm double terminated "floater" quartz crystal from large pocket
Field Collected: Tom Mortimer
Catalog No.: 961
Notes:
Highslide JS
QUARTZ   Mine Falls Park, Nashua, NH
2.3 cm quartz crystal

Species:           QUARTZ
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 2.3 cm quartz crystal
Field Collected: Tom Mortimer
Catalog No.: 1567
Notes:
Highslide JS
SPHALERITE   Mine Falls Park, Nashua, NH
4 cm specimen of massive sphalerite

Species:           SPHALERITE     ZnS
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 4 cm specimen of massive sphalerite
Field Collected: Tom Mortimer
Catalog No.:
Notes:
Highslide JS
STILBITE   Mine Falls Park, Nashua, NH
8 mm field of view. Limonite coated stilbite crystals on quartz.

Species:           STILBITE     NaCa4[Al9Si27O72] · nH2O
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 8 mm field of view. Limonite coated stilbite crystals on quartz.
Field Collected: Tom Mortimer
Catalog No.: u660
Notes:
Highslide JS
STILBITE   Mine Falls Park, Nashua, NH
Largest stilbite crystal is 4 mm

Species:           STILBITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: Largest stilbite crystal is 4 mm
Field Collected: Tom Mortimer
Catalog No.: u658
Notes:
Highslide JS
STILBITE   Mine Falls Park, Nashua, NH
9 mm field of view

Species:           STILBITE
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 9 mm field of view
Field Collected: Tom Mortimer
Catalog No.: 1062
Notes: A stack of 26 images processed with Helicon Focus. Multiple crystal habits of stilbite were observed at Mine Falls Park.
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SYNCHYSITE-(Ce)   Mine Falls Park, Nashua, NH
0.3 mm pale yellow, hexagonal Synchysite-(Ce) crystal with deep blue Anatase crystal

Species:           SYNCHYSITE-(Ce)     Ca(Ce,La)(CO3)2F
Locality:          Mine Falls Park, Nashua, NH
Specimen Size: 0.3 mm pale yellow, hexagonal Synchysite-(Ce) crystal with deep blue Anatase crystal
Field Collected: Tom Mortimer
Catalog No.: u392
Notes: Synchysite-(Ce) indicated by EDS analysis performed on a Bob Janules specimen.