STRENGITE Gallery Return to Strengite page. Click on image for larger view | |
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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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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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. |
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. |
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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: |
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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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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. |
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Species: STRENGITE Locality: Valencia Mine, Groton, NH Specimen Size: 0.15 mm white strengite crystals on rockbridgeite Field Collected: Dana Jewell - 1989 Catalog No.: u2645 Notes: An EDS analyses , VAL06 result indicated strengite with a bit of Al, an allowed minor element in strengite per mindat.org. |