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Found 53 results

  1. Hello TFF, I purchased this relatively inexpensive specimen at Mineralfest this past fall, and I was wondering if anyone could tell me more about it. The seller informed me it could possibly be from Madagascar, but was transparent in admitting that she couldn't confirm for sure. It was with other pieces of petrified wood that were brown, but I was drawn to this one due to the red hues. I think it's agatized, and it looks "glassy," although there are too many impurities to shine a cell phone light through it. One side is polished, and I put water on the rougher backside to show more of the details in the coloration. When I went to research the process of identifying tree species from petrified wood, I came across high powered microscopes that could identify structures on a cellular level. I don't have access to that sort of technology, but I was wondering if anyone has any guesses as to what the species could be, how old it might be, what it might be made of, or any other information that could be gathered from looking at the specimen. I'm always curious about what the prehistoric "story" could be behind a fossil, or anything related to the unique biology of ancient life. Thank you for your time, and your knowledge is greatly appreciated!
  2. Agatized Coral? Nut? Seed?

    Found in landscaping bed in south Texas I think it could be a solitary coral.
  3. Gizzard stone

    Found in a small Yellowcat wash, outside Moab, UT while scouring for petrified wood. Not near a uranium mine. Partially exposed and nothing else like it around the area all day. The wash was in Morrison material. About 3” x 5”. Super shiny even without washing. Thanks!
  4. Not a Thunder Egg

    Hi guys, avid rock hunter here, brought home this “thunder egg” from crater of diamonds in Arkansas a few years ago. I finally got a slab saw and it’s not what I expected! It’s semi transparent in spots and some druzy inclusions. Some areas seem a little oolitic? Could it be an “agatized” fossil of some sort?
  5. This fossil was found on a Gold Coast beach in 2019. I'm thinking Pliocene as it's like most of my beach fossil finds. It's a curiosity as it has some crystals inside the carapace. Any thoughts on this? Thankyou!
  6. Fossilized Conifer, anyone?

    Some petrified wood found in northwestern New Mexico, San Juan Basin, Upper Cretaceous, Kirtland Formation a couple of weeks ago. The cut slabs are from a log about 6-inches in diameter and my best guess is conifer only because most everything else in that area turns out to be conifer, specifically, Cupressinoxylon sp. Any other opinion about species would be welcome. There are several nice agate bands running through the length of the log and are clearly visible here. The first slab is dry and the second is wet.
  7. Agatized Bone Oregon coast

    Any Ideas on this?
  8. Hello All, I’m a newbie to this forum, subsequently solving my many fossil and rock mysteries. This one has me stumped. Surely it cannot be a fossil inside? Does that even happen? Also, it’s more defined than any other agate I’ve seen here (Haida Gwaii). Gosh, I sure hope this is an agate (please prove me wrong, if I’m wrong)! Thanks a mil.
  9. Just a rock, or a fossil bivalve?

    Happy new year. This is my first attempt at a post, so try and go easy. I respect the depth and breadth of knowledge in this forum. Thanks for yours in advance. Unfortunately I do not have a proper provenance for this specimen. This peice was purchased at auction with a rock lot, silified chalcedony (agate), and I was surprised at the symmetry and shape. My amateur mind brought me to fossil bivalve. Another specimen from the same lot shows this exact shape and general size, so here I am. What are your thoughts? Thanks again. 125mm x 115mm x 60mm 1216g or 2lb 10oz
  10. Bug or no bug?

    I found this agate on a beach in Northern California. It appears to have a flying insect trapped inside of it. Is this even possible? Or is it an illusion? Who would I contact to find out for sure?
  11. stromatolite or stromatoporoid or what?

    The fossil I am posting today does not contain calcium. I does contain agate and my question is could it be a fossil stromatoporoid or stromatolite or something else?
  12. Is this agatized coral?

    I wish I could recall for sure where I found this. Most of my collection is from tide pools and coves on the West coast of the US but it could possibly be from Zion National Park in Utah, Kern River in CA, or a number of other places but those listed are most likely. It’s porous, lighter and slightly warmer than stone. The dark red areas are striated and softer than the rest. It does resemble some photos I’ve seen of agatized red horn coral, but I’m not sure. Any ideas or suggestions are welcome.
  13. Is this petrified wood or agate?

    I am not sure if this is petrified wood or an agate. Origin: Arizona. Please help.
  14. Beach agate, possible bivalve?

    I found this on a rocky beach in West Seattle. Looks to be pretty transparent with a bit of banding. I assume it's just geological, but based on the size and shape I guess it could maybe be a bivalve fossil? SG is 2.61
  15. Agate or petrified wood

    I am pretty sure this is an agate or maybe petrified wood. It is a 1/4" slab and solid. Any help would be appreciated
  16. What is this?

    I have a 1/4" slab of ? I have no clue what it is. It looks like jasper or agate? It is solid considering how thin it is.
  17. Is this an agate?

    I see banding on the edges, so is it an agate? I cut it in half and it has a purple inside. Is that amethyst?
  18. Dinosaur head with skin?

    Trying to figure out if my friends fossil is a dinosaur head with scaly skin or possibly turtle?
  19. another piece of weirdness

    found this in the gravel piles ... its weird for sure. Not sure its a fossil think its a not-fossil ....could be some type of agate?. location: west of Houston in Brookshire gravel load from Brazos river size 1"x1 1/2 " inch.
  20. Here is another one that I would like to know.

    Someone asked for a closer pic.
  21. I found this rock 50 years ago on the farm where I grew up in northern Illinois. The bedrock is far below the surface there. The surface rocks are erratics, dropped by glaciers that moved southwest from Canada through Michigan and into Illinois. It appears to be a kind of agate with some druzy quartz on it. I've recently shown it to several people and have gotten several different opinions on what it is and how it was formed, including that it is some kind of fossil. What do you think? The surface lines you see in some of the photos (most clearly in the third photo) are narrow and evenly spaced. There are about eight lines per millimeter. I increased the contrast in the ninth photo in an attempt to make the lines more visible. The other photos have not been manipulated, except by cropping. The pit in the third photo is about 2mm x 3mm and about 15mm deep.
  22. A few more samples from another area near Fallon, NV I believe is Petrified Wood or other? Thank you.
  23. Is this bone in corprolite?

    My research indicates this should be a corprolite.. there is a chunk of something that kinda looks like agatized bone in it.. Thoughts?
  24. Oolites or something more?

    I found this 40 lb chunk of what looks to be oolitic chert with some agate tubes running through it in east-central Minnesota while out agate hunting. Maybe it's considered a cold water agate, but I'm not really sure what that truly means anyways. Either way, I was wondering if there is something more to this structure besides oolites. Maybe some kind of coral or other reef building organism? Any more information would be great. Thanks!
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