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Strengite and phosphosiderite are dimorphs. They both have the same chemistry, so cannot be differentiated by EDS analysis. They both also occur in a habit of small ball-aggregates. [tm] I have assigned the pink to lavender balls to be strengite and the blue to purple balls to be phosphosiderite. This may, or may not be, correct.
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STRENGITE    Palermo Mine N. Groton, NH
1.2 cm field of view. Rockbridgeite vug filled with pale lavender strengite crystals.
Species:           STRENGITE  
Locality:          Palermo Mine, N. Groton, NH
Specimen Size: 1.2 cm field of view. Rockbridgeite vug filled with pale lavender strengite crystals.
Field Collected: ex. Bill Henderson
Catalog No.: A Joe Mulvey specimen, ex. Bill Henderson
Notes:
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STRENGITE    Fletcher Mine, N. Groton, NH
1.2 mm field of view


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STRENGITE   Fletcher Mine, Groton, NH
1.1 mm field of view
Species:           STRENGITE  
Locality:          Fletcher Mine, N. Groton, NH
Specimen Size: 1.2 mm field of view, top photo
Field Collected: Clayton Ford ?
Catalog No.: u959
Notes: Gift from Gordon Jackson. Matt Butler examined some small grains from this specimen with a polarizing microscope and reported: "looking at the pink crushed grains I see interference colors but no noticeable pleochroism so maybe strengite."
A second photo Jan., 2022.
Highslide JS
STRENGITE    Fletcher Mine, N. Groton, NH
4 mm field of view. Lavender strengite balls with black rockbridgeite on yellow unknown crystalline matrix.
Species:           STRENGITE  
Locality:          Fletcher Mine, N. Groton, NH
Specimen Size: 4 mm field of view. Lavender strengite balls with black rockbridgeite on yellow unknown crystalline matrix.
Field Collected: Clayton Ford, 1960's. Acquired by Gordon Jackson 9/22/03. Gifted to T. Mortimer 3/19/16.
Catalog No.: u1957
Notes: Analytically, even quantitative EDS cannot differentiate stengite from phosphosiderite. Both have one P, one Fe, and two waters. Granted strengite is orthorhombic and phosphosiderite is monoclinic, but with a ball form, there is nothing to go by. On mindat.org, there are 216 strengite photos and 829 phosphosiderite photos, (Mar. 2016). About a third of each of these are ball form and both species have photos of pale violet and pale blue balls. I think the New England collecting community has a preference for naming the violet balls as strengite.
And then we also have koninckite, that has essentially the same chemistry, but one less water and also forms pale pink balls.
Highslide JS
STRENGITE with Rockbridgeite   Fletcher Mine, N. Groton, NH
2.2 mm fov.
Species:           STRENGITE with Rockbridgeite  
Locality:          Fletcher Mine, N. Groton, NH
Specimen Size: 2.2 mm fov
Field Collected: Clayton Ford. Ex. Gordon Jackson
Catalog No.: u1957
Notes:
Highslide JS
STRENGITE    Fletcher Mine, N. Groton, NH
2.8 mm field of view
Species:           STRENGITE  
Locality:          Fletcher Mine, N. Groton, NH
Specimen Size: 2.8 mm field of view
Field Collected: Inge Jewel
Catalog No.: A Bob Wilken collection specimen
Notes: Bob Wilken identification.
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STRENGITE    Fletcher Mine, N. Groton, NH
0.3 mm strengite crystal


Highslide JS
STRENGITE    Fletcher Mine, N. Groton, NH
2.2 mm field of view
Species:           STRENGITE  
Locality:          Fletcher Mine, N. Groton, NH
Specimen Size: 0.3 mm strengite crystal, top photo.
Field Collected: Clayton Ford. A gift from Gordon Jackson
Catalog No.: u957
Notes: Crystals are in a small vug in rockbridgeite.