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Dwarves' Earth Treasures Museum:
Richardson Ranch Thundereggs
Blue Beds of Richardson Ranch, 
Madras, Jefferson Co., Oregon
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    The Pridey(Blue) 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 from Blue Beds would show highly white "waterlines" centers in constrastion with dark blue to black banded agate rims. There were some recent mining of Blue Beds that hadn't been mined since 1960s and I do not know if they're still producing.

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Rough Appearance:  Oval thundereggs with geometric ridges, sometimes missing rhyolitic top & bottom caps, can be in clusters.
White opal "waterlines" are norm in the thundereggs, but colorful banded and waterlines agates can be found, often with weird inclusions.
It should be noted that the thick caps are the top and bottom of the thundereggs and "waterlines" are parallel to the caps.
Difficult to distingish between the uncut thundereggs of Blue and Red Beds.


Highly colorful thunderegg! Highly colorful thunderegg!
"BlackJack" type(?)
 Mossy thundereggs
Typical thundereggs with white waterlines