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Showing results for tags 'Agate'.
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Hello everyone! I've been looking at this forum for awhile now. I just joined but have read many topics on here to gain insight into some of my finds. I love agate, Jasper and looking for fossils. I always loved rocks but never knew that the ones I found my eye on and kept would be some beautifully unique gems. Thanks in advance for your help and in retro for the knowledge I've gained from a few of you so far!
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Found in Michigan LP. Devonian age probably? Loads of corals and other agatized fossils wash up on that beach. This is the only one I’ve found like this.
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A few year ago(3?) A very generous forum member Gift me a self- collected Thunder egg. That member was our very own @Brett Breakin' Rocks. I have been meaning to have it sliced open ever since I received it. The plan was to cut it, using my local club's rock saw. Unfortunately i am a forgetful guy. Every time the club had the saw set up for use, i would forget and leave it home. Eventually i just told myself that as long as i have it uncut, i will have a gift to open some day. So, it sat on a shelf for a long time............until today! Today my local club held their annual club picnic. It has become a tradition that one of our members brings 2 rock saws. One is used for cutting geodes, the other for cutting slabs of stone to be made into jewelry. So I remembered my thunder egg and got it sliced. My egg was filled with a nice blue color agate it is lighter around the outer edges, and gets darker towards the middle. I took 2 pics, one shows how it looks dry, the other, how it looks wet. Unfortunately the pics do not show the difference very well. But I plan on getting one half polished to bring out the color, the other half i may have one of my gem club members turn it into some sort of jewelry. Anyways, Thank-you once again Brett! You are a good man! Pic#1- dry Pic#2-wet
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I found this weird rock around limestone of Paleogene age near Khurais east of Riyadh Saudi Arabia. is it a agate? and how does it form. thank you all for your time!
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Stromatoporids, other sponges, or not a fossil? Thanks!
SilurianSalamander posted a topic in Fossil ID
All collected in gravel and beach rocks from SW Wisconsin. Thanks so much for the help! I love this community:)
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While rockhounding 20 miles north of Utahs veyo volcano, in a basalt strewn field, my son and I came across what we thought were two rocks that may be fossils. One looks to be a piece of agetized bone. The other not so sure. We would appreciate your assistance in determining if they are anything more than what we originally thought. Thank you.
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I live in Richmond, Virginia and recently discovered a bounty of agates in my back yard. Here are pictures of one I found yesterday that is different from all the others. There is still some dirt/mud from the garden in the crevices. I stopped cleaning it after seeing bits of druzy quartz along a seam in the agate and wondered if it could possibly be a fossilized head of some sort? I looks like it spent some time tumbling in a creek or something of that nature (most of the other agates are rounded Patuxent stone types). Also, I apologize for not including a metric ruler, but I've included a picture with a US quarter for scale. Thanks for your help!
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Agatized sponge? Found in door county Wisconsin - Silurian
SilurianSalamander posted a topic in Fossil ID
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Hey all, My daughter and I were agate hunting in Oregon's North Coast Range, when I scooped this curious piece out of the river. These grooves or striations have me wondering if this may have formed against some type of mollusk fossil. I would know this mineral as a "seam agate", however I have never seen grooves/striations like this before in the chalcedony. Has anyone encountered anything like this before or have any thoughts. I'de be curious to know more if anyone has. Thanks!
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Found this fossil in an agate of unknown age from a gravel pit ...
SilurianSalamander posted a topic in Fossil ID
I think it looks shockingly similar to charnia. Maybe a cephalopod, snail, or plant? What could it be?
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sponge or tabulate coral? Agatized Paleozoic fossil found in a gravel pit
SilurianSalamander posted a topic in Fossil ID
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From the album: fossil wood
giant slice of fossil wood with pink and brown color. Pink, as I think, is rare..., have not seen many of them. This comes from Arizona, near petrified forest, from an old collection. Size is around 80 cm, this is nearly 34"© fossils worldwide
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Need help confirming what I found. This speciman was found in Milwaukee, WI. I found it in some loose landscape rock around the building I work in. Unfortunately I don't have a ruler on me right now but it's about 2 inches long and 3/4 inches wide. Originally I thought it was agate but someone in my rock group on Facebook says it looks to be silicified stromatoporoid. After doing a Google search I came across stromatolites also. So I'm not sure which one it could be. It's a beautiful specimen. What looks to be quartz on the bottom and what I originally thought was agate surrounding it. Any ideas of what this could be? Thanks a ton! (Sorry about holding the speciman. These pics were taken when I found it and I have the specimen at home and not on me right now. I tried to crop out my fingers) Pics: side view, end view and top view
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Howdy, I was wondering if anybody could tell me what they think about these rare coral fossils that I find on the Oregon Coast. They are agatized and take a nice polish. Thank You
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I found this really interesting rock while cleaning my pond over the weekend. The pond is lined with round river rocks (presumably mined here in Oregon) and this one caught my eye as I was cleaning. When I looked at it a little closer, it appears to be petrified wood with some type of bore holes. Some of the bore holes are filled with what looks like agate and others have what one might imagine a dried out petrified worm might look like. I looked at it under magnification and noticed what looks like a couple of very small (<1/8") fossils. The clearest one is in the center of the first photo. One half looks like a series of radial lines (like a pill bug) and the adjacent half looks like really tiny scales or similar regular texture which isn't really visible in the photo and I couldn't get a shot through the scope. Is this actually petrified wood with bore holes and how does the agate-like material get in there and could a worm or grub get petrified? Thanks for your thoughts. Steve
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Is it a "Turritella Agate" - chertified fossiliferous lacustrine limestone in the Eocene of Wyoming, USA.or a sample from Brazil or Madagascar?
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Mineralogy, Geochemistry and Genesis of Agate—A Review - Online PDF file
Oxytropidoceras posted a topic in Rocks & Minerals
Götze, J., Möckel, R. and Pan, Y., 2020. Mineralogy, geochemistry and genesis of agate—A review. Minerals, 10(11), no. 1037. 51 pp. Researchgate web page with link to PDF file Yours, Paul H.-
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Folks on mindat.com suggested asking this question here! This is less of a "what is this a fossil of" question and more of a "is this possible" question. I have a small chip of translucent chalcedony showing a mass of white inclusions, two of which look very much like a grass seed-head. The gist of the conversation so far has been 'is it possible for fossil material to be an inclusion within a silica mineral like agate or chalcedony?' As opposed to an agate-replacement or opal-replacement fossil like an agate limb cast, agatized wood or agatized/jasperized opaque mudstone with intact fossil imprints of leaves and fish. Because pseudo-fossils in chalcedony are so common, with organic-appearing moss, dendrites and "garden" quartz mislabeled as fossil material all the time, there is a knee-jerk reaction of "never." But, am wondering... is it mechanically impossible or just highly uncommon? It has been suggested it may have formed in association with a mineral-rich hot spring, first as opal, then as agate. This was found in the John Day basin, Antelope/Ashwood area of central Oregon, in a drainage downslope from a 15-square mile basin that is ringed with lahar palisade formations (think Clarno palisades from John Day Nat. Monument.) The area has standing agatized tree trunks 5 feet high and 2 feet thick, and is full of smaller petrified wood and plant fossils. Age is 30-40 million years, in an overlap between John Day and Clarno formations. Private property, with permission. Apologies for the quality of the photos, am taking pictures with a phone through a hand lens.
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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!
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My dad, Marvin Mabbutt, was one of the early rockhounds in the American west. He put down the first set of tire tracks on roads that are now maintained by the county. And he picked up a lot of beautiful agates and jaspers back when there were a lot to be picked up. Regrettably, that is no longer the case. As a very early rockhound, he became a good friend of the head of the geology department at the local college and a founding member of the Board of Directors of the Eastern Utah Prehistoric Museum. (Now, the Utah State University Eastern Prehistoric Museum) -- mainly because he donated a lot of really great fossils to their collection. Can you say that Cope and Marsh were really that much different? I know that many of you don't appreciate what rockhounds have done to eliminate the smallest trace of fossils from thousands of square miles of desert land. I didn't do it. My dad did. I invite discussion on this interesting issue if you like. My life went in another direction. I became an engineer and had a career in computers. My main interest in joining this forum is to identify rocks so I can be more accurate in describing them. But I also want to learn some of what my dad knew about geology and fossils.
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Found in landscaping bed in south Texas I think it could be a solitary coral.
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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!
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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?
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I recently bought an unpolished turritella agate slab from a friend & he included an end piece with it. I was looking at a broken area of the end piece with my loupe and saw something that got me curious. So... I fired up my Dino-lite and ended up even more curious. The agate filling some of the shells looks almost like it is comprised of beads. From what I've seen online, it seems to be a common thing, but I haven't found any explanation of it. Pics 1 - 4 are from the rough broken section on the end piece, the 5th is from the slab itself (still not polished, just wet). Any ideas? I think it's quite pretty, but it's being an unknown (to me at least) has my mind clamoring for an answer.
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Hi. Is this a geode if the walls are smooth? I only have half of this 6lb piece but I have never seen a smooth inside of a geode, only covered in druzy.
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