EDS analysis efforts of several years to clearly identify a samulesonsite specimen have turned up only one strong samuelsonite candidate, the samuelsonite - type 2, below. All other suspect samuelsonite specimens have analyzed to be palermoite. In my [tm] opinion, any specimen labeled as samuelsonite without a supporting analysis is suspect, including most shown below.
Locality: Palermo #1 Mine, Pod 11, N. Groton, NH
Specimen Size: 2.2 cm specimen, (zoom view, 1 cm). Embedded blades of oxide stained type 2 samuelsonite
Field Collected: Bob Whitmore - 1972
Catalog No.: A Bob Whitmore specimen
Notes: A qualitative EDS analysis on an unpolished grain showed the Mn and Fe content lower than expected for samuelsonite: (Ca,Ba)Ca8Fe2+2Mn2+2Al2[(OH)2|(PO4)10]
The silicon peak may be due to surface contamination.
Black mineral on right side appears to be mostly manganese oxides.
A second EDS analysis #2 in Nov. 2014 on a polished grain from this specimen showed a very convincing match for samuelsonite. The formula for samuelsonite indicates the ratio for Ca:P:Al:Fe:Mn should be 9:10:2:2:2 . These ratios are consistent with this plot. The Si peak seen on the earlier plot is absent, indicating it was very likely due to surface contamination by silica.
Specimen Size: 2 mm prismatic samuelsonite crystal with smaller 0.5 mm samuelsonite crystal to right.
Field Collected: Clayton Ford. A Gordon Jackson specimen.
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Notes: This specimen contains several samuelsonite crystals. They are associated with platy habit goyazite.
Specimen Size: 2.5 mm field of view. Prismatic samuelsonite crystal with photo orientation to show termination in foreground.
Field Collected: Clayton Ford. A Gordon Jackson specimen.
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Notes: Another samuelsonite crystal on the specimen above. Platy habit goyazite in foreground.
Specimen Size: Group of prismatic samuelsonite crystals. Largest crystal in rear about 1.7 mm.
Field Collected: Clayton Ford. A Gordon Jackson specimen.
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Notes: Another samuelsonite crystal on the specimen above. This group is deep within a vug and difficult to illuminate
Specimen Size: 5 mm field of view. 1.5 mm prismatic samuelsonite crystals with chisel terminations.
Field Collected: Forrest Fogg.
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Notes: First of three photos of Bob Janules specimen.
Specimen Size: Group of 2 mm clear, parallel alligned, samuelsonite crystals.
Field Collected: Forrest Fogg.
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Notes: Second of three photos of Bob Janules specimen.
Specimen Size: Field of view 2 mm. Clear, parallel alligned, samuelsonite crystals.
Field Collected: Forrest Fogg.
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Notes: Third of three photos of Bob Janules specimen.