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Botryoidal Geode!
Botryoidal Carnelean!
Botryoidal Geode!
Big Sexy!
Botryoidal Plume Agate!
Botryoidal Formation!
Chalcedony Geode!
Geode Shot Glass!
Leopard skin Jasper!
Big Jasper!
A river runs through it!
Thunderegg Cut!
Agate Cut!
Fossiliferous Limestone Cut!
Breccia!
Agate Cut!
Beautiful Agate Cut!
Ooids inside!
Travertine Cut!
Agate Stone Cut!
Brecciated Jasper Cut!
Jasper Cut!
Agate Nodule Cut!
Leopard skin Jasper Cut!
Green Tint Basalt Cut!
Cold Rockhunt in a Hot Springs!
Snively Gulch!
Roadcut Snively Gulch!
Agate n' Brecciated Jasper!
Hot mess of Conglomerate!
Basalt Lavarock!
Jasper w/iron inclusions!
Big Daddy!
Chalcedony Chunk!
Fruity Pebbles Conglomerate!
Ironstone banding!
Quartzite w/patterns!
Brecciated Red Jasper!
Breccia!
My BFFs a BIF!
Blob o' Jasper!
Walkin' a wash!
Soapstone!
Breccia!
Conglomerate!
Jasper chunk!
Plume agate!
Jasper!
Jasper chunk!
Lavarock!
Breccia!
Red eye!
Interesting chunk o' Jasper!
Can't wait to cut this one!
Yellow Jasper!
Bruneau Jasper!
Out rockhoundin' the other daaaayie...
Thunderegg Inspection!
Plume botryoidal chalcedony nugget!
Plume slice!
Botryoidal slice!
Plume agate inspection!
Plume flow!
Botryoidal Chalcedony Nugget!
Playing with color!
Plume chunk glow!
Red dot glow slice!
Glow plume!
Carnelean Glow!
Jasper glow!
Glow Plume!
Plume chunk glow!
Slab o' Plume Glow!
Glow chunk!
Plume agate glow!
The green caught my eye!
Square geode!
Big ol' chunk!
Beautiful dark opal!
Hot Botryoidal Mess!
Plume agate!
A Bit o' Honey Plume Agate!
Brecciated jasper!
Plume agate!
Alien egg!
Half of a geode!
It's curved!
Plume Agate!
Botryoidal formations!
Carnelian sandwich!
Broken geode!
This half survived Monther Nature!
Plume agate!
Beautiful Colors!
Jasper, Chalcedony, Opal & ???
Cool Banding!
Rockhunting at Graveyard Point!
Botryoidal chalcedony!
Wash walkin'
Dark green metamorphic!
Pretty Orangey & Yella Quartzite!
Chalcedony Nodule!
Big Daddy Agate!
Reds!
Agate Chunk!
Beautiful Glow Quartz!
Iron Stained Quartz!
Yellow Agate Nodule!
White Iron Stained Quartz!
White Quartz!
Iron Stained Quartz!
Pretty Yellow Glow Nodule!
Thunderegg!
Half a Thunderegg w/Opal!
Botryoital Opal w/ A Little of Everything!
Pretty Red Jasper!
Succor Creek Canyon, OR.
Watch for Rocks!
Greens & Browns!
Big ol' nodule!
Hot Mess of agates!
White/Yellow Chalcedony!
Nodule w/ reds!
Spud 4!!!
Green Sandstone!
Botryoidal chalcedony!
Pretty greens!
Pretty red agates nodule!
Another nodule with reds!
Dinosaur Egg!
Into the "to be cut" box!
Geode?
Molten Sandstone?
Red!
Sandstone!
Example of minerals seeping into rocks!
Rockhounding near Mitchell Butte, OR
Love the Green!
Spud!
Chalcedony or Opal?
Mish Mash of Agate!
Shard of Agate!
Bright Red Agate!
Bright Green Agate!
Rusty Red Agate!
Colorful Agate!
Limestone!
Beautiful Reds! Jellybean Agate!
Jellybean Agate!
Definitely cut this one!
Colorful Jellybean Agate!
Big ol' Colorful Chuck of Agate!
Took forever to cut this one!
Thought this Thunderegg would be hollow!
Time to cut!
Green & White Chalcedony!
It's hollow!
Pretty green!
Glow cave!
Thunderegg Cut!
A Thunderegg is a geological structure similar to a geode but with unique characteristics. Here's an overview:
Formation: Thundereggs form within rhyolitic volcanic ash layers. They start as gas bubbles or steam pockets in the lava, which act as molds. Over time, these are filled with silica-rich fluids, mainly chalcedony, agate, jasper, or opal, creating intricate patterns and colors inside.
Appearance: On the outside, thundereggs look like ordinary, rough-textured rocks, often with a white-gray to reddish-brown surface. However, when cut and polished, they reveal a variety of internal structures, from solid agate or chalcedony cores to sometimes hollow centers with crystals.
Size: They can range from small, about the size of a baseball, to larger specimens over a meter across, though most commonly they are between two to six inches in diameter.
Locations: While Oregon, USA, is particularly famous for thundereggs, especially in counties like Crook, Jefferson, Malheur, Wasco, and Wheeler, they are found globally wherever the geological conditions are right. Other notable locations include Germany, Australia, Brazil, Canada, Mexico, Poland, Romania, and Turkey.
Cultural Significance: In Oregon, the thunderegg was designated as the state rock in 1965, reflecting its importance in local geology and culture. Native American legends attribute their formation to thunder spirits or gods throwing these rocks during thunderstorms.
Collection and Use: Thundereggs are popular among rock collectors for their unique beauty once cut open. They're often used in jewelry making or as display pieces due to their aesthetic appeal after being sliced and polished.
Variations: Each thunderegg is unique due to the minerals present in the area where it forms, leading to a wide variety in color, pattern, and structure even from the same bed.
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