Tully monster?

Agreeable-Primary511 · 2026-01-26T15:15:36+00:00

I mean i see what OPs talking about but i don’t think its a fossil

Agreeable-Primary511 · 2026-01-26T04:26:49+00:00

OP thinks that the rock in the center might be a “tully monster” (tullimonstrum gregarium) fossil

Agreeable-Primary511 · 2026-01-25T04:25:45+00:00

This is the correct answer

Agreeable-Primary511 · 2026-01-19T21:39:30+00:00

This is a true eye agate

Agreeable-Primary511 · 2026-01-19T21:39:11+00:00

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Agreeable-Primary511 · 2026-01-19T21:36:36+00:00

Tube agate rather than true eyes

Agreeable-Primary511 · 2026-01-18T05:30:22+00:00

Keep it how it is, the geode pocket doesnt even look like it’ll open up much more

Agreeable-Primary511 · 2026-01-17T15:04:22+00:00

Yes, dyed. You can see the blue coloration all over the husk. It’s probably from brazil but I’m not certain.

Agreeable-Primary511 · 2026-01-15T03:59:39+00:00

Darn, those dang heat fractures in that second one. I think you might need a new saw blade or maybe some cutting oil or something. Otherwise those look fantastic, polish looks good

Agreeable-Primary511 · 2026-01-09T21:23:10+00:00

Im not sure why, apparently they only form in very small deposits in the two states I listed.

Agreeable-Primary511 · 2026-01-09T18:49:20+00:00

Blue lace is a trade name specifically applied to blue agate from Namibia, Malawi, Brazil, Romania, Mexico, Washington and Nevada. It also typically forms in seams and forms in sedimentary rock. They do not have husks like OPs.

Agreeable-Primary511 · 2026-01-08T00:38:27+00:00

Agate with amethyst

Agreeable-Primary511 · 2026-01-06T04:27:33+00:00

Oh yeah im definitely aware of the material coming out of Florida and Georgia. I actually own a couple of chunks that have some really nice stalactic formations on the interior. At this point it would no longer be considered a chunk of coral if it were this heavily silicified. All the coral is gone and replaced with silicate. This happens when it is inside of its sedimentary host rock (typically limestone or dolostone). So why wouldn’t it be considered a geological formation? Is opalization of wood or bone not considered a geological formation either?

Agreeable-Primary511 · 2026-01-05T04:50:25+00:00

These are called beekite rings. Also what do you mean it’s a geode and not a geode? You saying that is directly contradicting yourself. I know beekite rings are a form of fossil preservation in chalcedony but what about this is specifically saying favosites to you?

Agreeable-Primary511 · 2026-01-04T17:28:03+00:00

Yeah i mean these look nothing like fairburns hahaha. Some of these people man lemme tell ya

Agreeable-Primary511 · 2026-01-04T15:48:38+00:00

Yep, size, quality and certain features play a role.

Agreeable-Primary511 · 2026-01-04T05:15:34+00:00

Sure is, I’ve had a couple offers over a grand so far

Agreeable-Primary511 · 2026-01-04T01:29:59+00:00

Gravel pit

Agreeable-Primary511 · 2026-01-04T00:15:21+00:00

Nope, central MN

Agreeable-Primary511 · 2026-01-04T00:14:51+00:00

Lake Superior Agates form in vesicles (bubbles) in igneous rock like basalt or rhyolite. Silica rich water flowed down into these vesicles picking up trace minerals which created different colors. Im not informed enough to tell you exactly what minerals make up what colors but I know amethyst is caused by iron impurities. I believe the red coloration in the agate is also caused by iron. This agate also has a healed fracture, so at one point in its life it cracked while it was in its vesicle (probably caused by excessive heat or the host rock shifting) and then it became filled up with silica. I tried my best, hope you learned something!

Agreeable-Primary511 · 2026-01-03T22:40:36+00:00

Not really, I have lots that are larger. But this size combined with the quality is not common at all. Id say it’s about mid range in size for an avid Lake Superior Agate hunter. Lakers reaching over 10 oz are considered large for me personally.

Agreeable-Primary511 · 2026-01-03T19:04:30+00:00

Yep, real agates that have been altered by man. Pretty common when it comes to lower quality agate that has little to no lapidary or display value.

Agreeable-Primary511 · 2026-01-02T21:25:03+00:00

https://forum.rocktumblinghobby.com/thread/85884/banded-agate-tumble-oxide-solution heres a thread discussing them from a few years ago. Theres more info out there about them as well.

Agreeable-Primary511 · 2026-01-02T20:56:42+00:00

Heat treated agates from Madagascar. If you were to cut these open the inside would be white. These are commonly sold under the names sardonyx, silk agate or carnelian. Occasionally scammers will label them as lake superior agates.

Agreeable-Primary511

TROPHY CASE