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d_day

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Everything posted by d_day

  1. Green crystals? Magnets have a slight reaction? Light grey powder when crushed? Sure sounds like basalt to me. Olivine (aka peridot) is often found in basalt. Again, it’s very hard to make an ID from pictures, so I’m not going to say 100% it’s basalt, but I’m certainly leaning in that direction. And some tips for cutting: Cutting very hard stones, and trying to cut too fast can glaze your blade. Basically, steel from the blade is dragged over the top of the diamonds, which greatly reduces their effectiveness. You can deglaze the blade by cutting a silicon carbide sharpening stone or old g
  2. Doesn’t look like anyone’s carved it to me. Looks like it was broken by geological pressures and lots of time. If my ID is correct, the stone in the middle is a remnant of whatever it formed on. It could be other minerals too. If you do a streak test and the streak is brownish black, then it’s probably psilomelane.
  3. Looks like a fragment of botryoidal hematite to me. Could be a few other things though.
  4. First one’s got me stymied. At first glance looks like a granite of sorts. Might be a quartzite. Can’t really tell. Can’t give a positive ID on the second one, but it looks like basalt to me.
  5. Zooming in on your second picture it looks very much like horn coral. The only horn coral fossils I’ve seen have been composed of calcite which is quite soft. Makes me question my ID. Perhaps horn corals from some locales have been replaced with silica which is much harder, and perhaps that’s what you’ve got.
  6. Yep. It’s an agate. Possibly from Brazil based on color, but it’s so common it could be from almost anywhere.
  7. That’s what I was thinking. Looks like they’ve been river worn too.
  8. Hard to tell from photos alone, but I’m going to guess it’s jasper.
  9. Well, judging by the regular shape of some of those, I’m going to guess they’re man made. Aside from that I’m clueless.
  10. I knew I should have checked this thread more frequently. It’s been close to 25 years since I first met Jim, and at least 15 since I last saw him. He was easily the kindest man I have ever met. He was more eager to teach than I was to learn, and I was extremely eager to learn. We rode to many hunts together, and I listened intently to all he could offer on those long drives. He loaned me his Tesoro Diablo on hunts so many times that many people thought it was mine. The plastic coffee cup he gave me to sort dirt with is one of my most prized possessions. I may have forgotten much of what h
  11. That’s a good sized one! It oughta make some nice cabochons if that’s your thing. By the way, the matrix is most likely to be a rhyolite, which is most definitely igneous.
  12. Sure looks like an agate or chalcedony nodule to me. Very common stuff in the area. You might get some good banding if it’s big enough to cut. If it’s small, tumbling would give it a great polish.
  13. Probably a limestone concretion. They’re pretty common out that way.
  14. Based on appearance alone I’m going to say no. My guess based only on your pictures is that it’s a piece of chalcedony. Have you done a hardness test? Know the specific gravity? This info along with better pictures taken in full sun will get us closer to a proper ID.
  15. It is almost certainly a concretion of some sort. There’s a chance it’s a heavily weathered septarian nodule, but I think it’s just a run of the mill concretion. I really like your snail fossils in the foreground.
  16. Yeah this is how I feel about Yooperlites. There’s not really anything to be gained by cutting one. Ultimately though, it’s yours, and you should do with it what makes you happy.
  17. Okay, between your answers to Fuss’s questions and your new pics I’d say it’s labradorite or spectrolite. Both are feldspar with play of color, but depending on who you talk to spectrolite only comes from Finland, or is labradorite with a black base color.
  18. Okay, those pics are far better than the first, but they’re still blurry. I think though, that I can tell a little something about it now. Looks like you’ve got a piece of something opaque like basalt, with a small chalcedony inclusion.
  19. Vitreous carbon has a Mohs hardness of 7, which means it doesn’t leave a streak. OP’s example leaves a black streak, so it’s not vitreous carbon.
  20. It’s really hard to tell from pictures alone, but the first looks like either marble or quartzite. The second I’m going to guess is a pegmatite, because it looks like it’s got a decent sized piece of schorl in it.
  21. I’m going to guess that this is some sort of industrial byproduct.
  22. Bits of it are. This is what’s known as pegmatite. It’s a course grained granite. It’s composed of quartz, feldspar, and mica. It sometimes contains beryls and/or tourmalines.
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