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Showing results for tags 'mineral'.
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I have a small 4” tile saw, but and looking for something bigger. Given the blade can be changed for rocks, is there enough of a functional difference to justify buying a dedicated rock saw versus a tile saw? Is lack of power for bigger rocks a consideration at all on the tile saws? thanks
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Hi, always from the Omhden (DE) quarry. I'm wondering what this dark mineral actually could be... I'll report 2 different speciments, both about 10-15cm in length. They have little white "spiderweb" across the dark lucid surface. it is like 1mm thick this could be really useful for beginners like me thanks a lot Paolo
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I found this rock in the mountains of Taif in Saudi Arabia and it is plutonic origin and is pretty dense I would estimate 4-5g/cm3. The mineral is black and very shiny and under a modest microscope I can see interlocking columns of greenish black crystals. I used a strong neodymium magnet to see if it was magnetic and it was not magnetic which means it doesn’t contain the common metallic minerals. What could this mineral be?
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Hello, I found this rock in a metamorphesized area of chlorite schist with tons of giant quartz veins everywhere. I found this mineral which I have never seen before and it was also present in the quartz. it’s brown and coarse as if it were sandstone. What could it be?
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Help! What is this? Botryoidal Hematite? A-A Basalt? Or WORSE?
Jellybean07 posted a topic in Rocks & Minerals
I found this in Starkville, MS and assumed it's ah-ah basalt, but was looking up different random minerals and "uraninite" came up. This couldn't possibly be a raw form of that, could it? They all came from the same place, a chalk-based cretaceous seabed. There was also marcasite in the chalk, not pictured. Some have some iridescence on the black glistening places, reminding me of iridescent hematite. I would love to learn what you all think! Thank you for your time- 23 replies
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Denver Mineral, Fossil, Gem & Mineral Show 2022
Top Trilo posted a topic in General Fossil Discussion
Today I took a trip to the annual Denver fossil show, I really enjoyed it and it wasn’t 90+ F (32+ C) this time. There were fossils and minerals from all over the world, all though mostly minerals. I tried taking pictures of mostly different fossils, and they are not representative of what was at the show. If you do decide to go (it’s open for another week) look out for fakes and resorted and composited material there were many of those. It was fun to wander around looking at everything even if most of it is far outside my budget.- 37 replies
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My fossils collection with 3D printed drawer compartments
adriano posted a topic in Member Collections
I finally completed the reorder of my collection of fossils and minerals. It is a wooden hexagonal display cabinet of several wood/glass shelf; in the pictures attached I only show some of them. I 3D printed more than 20 custom drawer compartments for the smallest specimens. I decided to go for a modular design, so I can adapt every compartment to the specimen. As printing material, I used a "wood PLA" filament 3D printed with 1 mm nozzle on the Alfawise U20 3D printer. LINK I finally added a strip LED inside the cabinet door and powered it via a USB power-bank - so it is fully wireless. In this picture you can see some of my recent purchases: Two Sinosauridae indet. teeth from Kem Kem One Acheroraptor tooth from Hell Creek formation, Powder River Co., Montana Some Mosasaurus teeth from Kem Kem One Pterosaurs tooth from Kem Kem A piece of Rhinocerontidae indet. jaw from South Dakota Some ammonites, shark teeth, a Flexicalymene ouzregui, a couple of echinoids (I found the white one in a brick!); the Velociraptor skull is 3D printed as well. This is the other side. The big sand echinoid was also found by me in a brick! On the right there's a nice fossil coral: I never seen something similar, please let me know if you know it's name. Three fossil fishes and a nice ammonites cluster with some quartz in the background. At the end, some minerals... Now I only have to finish the cataloging of all specimen. I already finished with fossils, now I have to start with minerals - it will be very looong! What do you think? Do you like it? Ciao! -
Not sure if this rock is a fossil or unique mineral deposit that created uniform circles within the rock. My amateur guess would be maybe coral fossil?
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So found this today in our stream and never seen anything like it. Originally thought it was a plant or bit of wood however is definitely stone/mineral/bone after the teeth test. Our best guess is a stalactite however we have no clue. If anyone can give us a rock ID or a fossil ID would love to know more. It’s just over an inch in length no more then 35mm with a hole/tube going through it
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- costa rica
- fossil?
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Found this unusual colored river polished rock in Texas creek. is this petrified wood or some sort of quartz etc. ? mineral experts please weigh in. this color is unique for my area.
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This is a tusk I prepped a few years ago, sourced from central Alaska. It was in great shape for being a partial, no breaks to repair or even major cracks to fill, all natural besides a little stabilization and polishing to bring out the colors. Really strong vivianite on this one and inside the internal cavity appears to be crystals. It was tricky to get a good photo of them, but see below. I took a few of the inside shots with a UV flashlight as well as just a flash. Vivianite crystals?
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This was among a batch of discarded rocks and minerals that a college geology department left behind (dumped in the woods but rescued by a family member of mine) when the college closed. I am starting from scratch in ID'ing all of them, origins unknown. Might this be Aragonite/Cave Calcite? I know that Aragonite isn't actually calcite, but I have seen formations similar to this referred to as Cave Calcite? It is hard - scratches glass, not scratched by a metal object, does not fizz with full strength industrial vinegar, measures about 6cm long. Thanks! Ramona
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Found this earlier today in Hamilton, Ontario. It was next to railway tracks, so at some point it was brought there with other gravel. Would really appreciate if anybody could help figure out what it is. Thanks
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Interesting.... formation I found. Please, tell me all that you know.
Ikikit posted a topic in Rocks & Minerals
Found this out hiking and was hoping someone could give me a more knowledgeable analysis of it, based on what can be seen from the photos. Good luck to everyone out hunting fossils and whatnot and thanks in advance for any replies. -
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This one has been sitting in my "interesting but I have no clue" pile for a while. When I found it, I was splitting limestone laying in the stream. I've found that when you split limestone, immediately after splitting you'll get a couple moments of a sharp looking specimen before things start to oxidize. The limestone is a very dark gray, or almost black color. You either see black limestone or white calcite pieces while splitting. I split this particular piece open and right in the middle was a 3-4 cm long, 8 mm wide gold looking rectangle in the middle of the flat broken limestone. I thought I wouldn't get to recover it, but one hammer hit later it popped out and I was able to save it. I do find that plants in the limestone seem to get the gold or pyrite type preservation. I've found one small straight shelled cephalopod preserved like this. But overall, it's very rare here. I have maybe 3 or 4 larger pieces of what I'd called pyrite type material I've recovered. Below are some stacked microscope photos of it. The scale in the first photo is 1 mm for each mark. You can see the grain that runs left to right. This looks like wood to me, but I haven't had that confirmed before. The next two photos are a view looking from the bottom to the top of the first photo. What has me most curious are the perpendicular grain marks that are found in this area. They don't seem to just be on the outermost layer, as you can see more deeper. I'm not sure if this is some sort of perpendicular crystal pattern, or it's just the shape of the original material that was replaced with the mineral. And maximum zoom. A stack of 12 microscope images taken through the lens in the same area of the above photo. And that's it. Is this a small piece of woody material that was preserved in the sea? I wonder if vinegar would clean this up or destroy the mineral as well.
- 14 replies
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- brush creek limestone
- carboniferous
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This just fell into my lap, but I'm having a hard time telling exactly what it is. Seems to have been burrowed in by clams? Worms? Somethingorother. Not my area of expertise, so I rely on y'all. Found in northwestern Natchitoches Parish, Louisiana. Sorry for the lack of scale, but I assure you, those are standard-sized human hands. First four photos are outside, last one is a straight-through cut. Any ideas? Appreciate the help as always!