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Dwarves' Earth Treasures Online Rock Shop:
Richardson Ranch Thundereggs
From several 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,, great pieces seem to be scarce 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/filled by agate.  As of January 2008 and to best of my knowledge, Red Beds, Blue Beds and Plume Beds are no longer being mined.

Updated October 2010, new specimen have 2010y in their code names..
Larger pictures of any interested specimens can be provided at request

2009yRCHEGGn57-$25 SALE $10 009yRCHEGGn39-$25 SALE $10
or $15 for the pair
2009yRCHEGGn59-$50, outstanding colors 2009yRCHEGGn60-$50, outstanding colors
or $80 for the pair

2010yRCHEGGn01-$35, rare color combo from Pony Butte area.