The non-reflective spheres could be of extra-terrestrial origin, but most likely they are oxidized (rusted) spheres from human activity blown in from who knows when or where.
Some more photos:
(Photo 2.) Spheres with metallic debris. (200x)
(Photo 3) Approximately 100 spheres gathered from about a two square yard surface area at nearby recreational area. A portion of panorama from 200x images which could have been obtained with a 30x to 50x lens. (Human hair with diameter of about 100 microns used as reference.)
I have many other photos from samples gathered from three other locations, all within 3 miles, so this is not an isolated contamination location, depending on your definition of "isolated .
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Doing it yourself -
(1) - Get a relatively strong magnet.
(2) - Cover the magnet with a plastic bag (or else the particles will be difficult to remove from the magnet).
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