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Dwarves' Earth Treasures Museum:
"Old Priday Bed" Thundereggs
Blue Beds of Richardson Ranch, 
Madras, Jefferson Co., Oregon
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    The Pridey Beds, Red Beds, Pony Butte, and Plume Beds now owned by Richardsons are one of most well-known thunderegg sites for many decades and it happens that the thundereggs are made the State Rock of Oregon. They may be most common encountered and most studied thundereggs anywhere, but even so and as expected of any agates and thundereggs, great pieces seem to be rare as expected of any agates and thundereggs. The best specimens would show alternating and constrasting layers of white, gray and black agate "waterlines" or highly constrasting and concretic bands. It appears that any strong colors like yellow, deep blue, and red are somewhat rare, and many Priday Beds thundereggs are also known to contain white to brown (sometimes red) moss/plume structures made of the minerals that have grown first before being covered by agate.  I had obtained few craters of Priday Bed thundereggs from Blue Beds and they were full of surprises... :) As of January 2008, Red Beds, Blue Beds and Plume Beds are no longer being mined.

All of the thundereggs below were obtained from an old stock of 1960s

Rare multi-colored thundereggs

Moss Agate,
 I have opened a can of earthworms!