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Post by hummingbirdstones on Apr 11, 2019 22:09:55 GMT -5
That's a beauty!
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Post by rockjunquie on Apr 12, 2019 7:28:33 GMT -5
Nice!
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,723
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Post by Fossilman on Apr 12, 2019 10:57:38 GMT -5
Nice cuts...….. Thumbs up
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Post by 1dave on Apr 14, 2019 9:07:12 GMT -5
Remember these start forming in the throat of a volcano amid lots of chaos, bumping into each other. As the magma cools different minerals begin crystallizing. Crystallization generates heat causing rythmatic crystallization. Earthquakes, landslides, temperature, pressure, water-level and Ph fluctuations = WOW! The large one shows where the "dimple" and "pimple" were once joined. Water lines were re-melted around the edges?
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,640
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Post by RWA3006 on Apr 14, 2019 9:23:35 GMT -5
Notice how the sides of the star seem to match if it were collapsed back in on itself? I'm thinking super heated water flashed to steam and "exploded" a void into the shape of a star and then it subsequently filled with Si2? Anybody know?
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Post by woodman on Apr 14, 2019 9:46:14 GMT -5
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Post by 1dave on Apr 14, 2019 9:54:07 GMT -5
Notice how the sides of the star seem to match if it were collapsed back in on itself? I'm thinking super heated water flashed to steam and "exploded" a void into the shape of a star and then it subsequently filled with Si2? Anybody know? Exactly! They start as crystobalite spheroids, heat up, covered by a layer of feldspar, then repeat billions of times. Finally as the surrounding rhyolite/obsidian contracts, the pressure slowly drops allowing the trapped high pressure water to slowly convert to steam, forcing the spheroid to rupture. Then over time the void is filled with other minerals. forum.rocktumblinghobby.com/thread/66102/orienting-cutting-thundereggs
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Post by woodman on Apr 14, 2019 11:14:11 GMT -5
These are a bit different.
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,640
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Post by RWA3006 on Apr 14, 2019 13:04:48 GMT -5
Bob, those are really interesting. They look like they didn't finish filling up the void. It's like a snapshot back into time.
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,640
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Post by RWA3006 on Apr 14, 2019 13:19:18 GMT -5
You're right. That's a good article and I enjoyed reading it. Thanks.
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Post by MsAli on Apr 16, 2019 17:47:33 GMT -5
These are a bit different. These are really cool!
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Post by woodman on Apr 20, 2019 21:14:40 GMT -5
Here is another Buchanan I cut today. Noticee the crystal points in the close up.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Apr 20, 2019 21:37:44 GMT -5
What a colorful little cavern! I've had hollow Buchanan's before, but not as gorgeous as that inside.
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Post by woodman on Apr 26, 2019 13:30:30 GMT -5
Richardson Ranch egg fresh off of the polisher!
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Post by miket on Apr 26, 2019 14:30:15 GMT -5
Richardson Ranch egg fresh off of the polisher! I never get tired of seeing these, thanks for sharing!
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Post by woodman on Apr 26, 2019 15:37:18 GMT -5
Cut another Buchanan today, now to degrease and sand and polish.
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Post by MsAli on Apr 26, 2019 16:39:04 GMT -5
Cut another Buchanan today, now to degrease and sand and polish. All kinds of goodies in that one
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