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. The only difference is a difference in the Fe oxidation state. 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.
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 0.6 mm red-brown siderite rhomb on manganese oxide coated earier generation of siderite
Field Collected: From a tub of Palermo phosphate rocks gifted by Bob Whitmore
Catalog No.: u1942
Notes: A nice, isolated, siderite crystal. Siderite is very common at Palermo, but isolated, photogenic, crystals are uncommon.
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 3 mm field of view, (zoom view 2 mm fov)
Field Collected: From a tub of Palermo phosphate rocks gifted by Bob Whitmore
Catalog No.: u1019
Notes: A stack of 27 images processed with Helicon Focus.
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 3.5 mm field of view
Field Collected: From a tub of Palermo phosphate rocks gifted by Bob Whitmore
Catalog No.: u1607
Notes: A stack of 37 images processed with Helicon Focus.
Locality: Pike Quarry, Hooksett, NH
Specimen Size: 0.5 mm anatase crystal on quartz crystals
Field Collected: Tom Mortimer
Catalog No.: u1751
Notes: A stack of 9 images processed with Helicon Focus.
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 0.4 mm jahnsite crystal
Field Collected: From a tub of Palermo phosphate rocks gifted by Bob Whitmore
Catalog No.: u1929
Notes: A stack of 7 images processed with Helicon Focus.
Locality: Mascot Mine, Gorham, NH
Specimen Size: 1.8 mm field of view
Field Collected: Bob Janules
Catalog No.: A Bob Janules specimen
Notes: A stack of 16 images processed with Helicon Focus.
Locality: Palermo Mine, N. Groton, NH
Specimen Size: 0.4 mm crystal group.
Field Collected: From a box of Walter Lane Palermo "rocks" on MMNE give-a-way table
Catalog No.: u1205
Notes: A stack of 23 images processed with Helicon Focus.
Locality: Madison Lead Mine, Madison, NH
Specimen Size: 1.0 mm cluster of hemimorphite crystals
Field Collected: Tom Mortimer
Catalog No.: u513
Notes: A stack of 31 images processed with Helicon Focus.
Locality: N. Sugarloaf Mtn., Bethlehem, NH
Specimen Size: 0.4 mm xenotime crystal
Field Collected: Tom Mortimer
Catalog No.: u570
Notes: A stack of 23 images processed with Helicon Focus.
This small crystal gave its life to science. When I went to put it back into its micro box, the crystal had fallen off.