The Frieda mine was a perlite mine just at the Railway stop at Dant, near Maupin; the eggs came from the opposite side. The thundereggs from the Frieda area often have charactristic pieces of black basalt within the egg-matrix. The color of the matrix has a large variety. I am not sure if all shown pieces come from one bed. More beds are present along the Deschutes river.
Kind of legendary are the green tubemoss Frieda eggs.
A nice piece written on the Frieda bed can be found here.
Just scroll a bit down for the article by Ralph Bishop with some nice tube moss egg pics…