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Everything posted by d_day

  1. What is this thing???

    Ironstone concretion fragment.
  2. is this a geode?

    I agree with Morlock on this one. It's a vug, not a geode.
  3. Help identify rock?

    I'm thinking basalt or black dacite. Tough to tell with only a photo. You have streak, hardness, and specific gravity info?
  4. 910-carat diamond from Africa

    Yes, I would. I would also expect them to be faceted and sold as smaller diamonds.
  5. 910-carat diamond from Africa

    I read an article not long ago that said large diamonds might be more common than we think. They said that the large ones may be getting pulverized by common mining methods. They also cited this mine's large finds as an example.
  6. Large mineral??

    Agreed, selenite
  7. You forget about fluorite, lepidolite, purpurite, and sugilite?
  8. First one looks like coal, but really hard to tell from a picture. Second one is chalcopyrite.
  9. #4 looks like a chunk of pegmatite #5 is a man made bismuth crystal
  10. What kind of stone is this?

    The "yellow lines" are crystals. I'm thinking aragonite, but I can't tell for sure from the photos. The third photo shows some chalcedony. Both appear to have grown on whatever the host rock is. And please, don't smash it as a previous poster suggested. The interesting parts are most likely surface deposits and breaking it open isn't likely to show us anything new.
  11. What kind of rock is this?

    Yeah I missed where he mentioned it would scratch with a knife. That certainly rules out augite.
  12. What kind of rock is this?

    Could be augite.
  13. I agree with AU Seeker. Piece appears to most likely be glass slag with a bit of the melt stuck to it. It's not at all uncommon to find slag, even in the middle of nowhere.
  14. What kind of stone is this?

    Is there any Schiller? If so it's probably some variety of feldspar. If no Schiller, I'm thinking water worn quartz. https://www.mindat.org/glossary/schiller
  15. What kind of rock is this?

    Looks like a river worn iron stained massive quartz to me.
  16. Round rocks

    They might be sandstone concretions which form in the same way as moqui marbles, just with a different composition.
  17. Very strange stone .. FOUND

    Photos are very blurry so it's hard to tell for sure. Part of me wants to call this a flint, and part of me wants to call it a concretion.
  18. I've seen this stuff before but can't for the life of me remember what it's called.
  19. Peridot is the gem name of olivine, not epidote.
  20. What might this be?

    My first impression is obsidian in perlite. Of course I could be wrong. That's just the impression I have from these pictures. Better pictures would help with a better ID. Best bet for an ID is a local university's geology department.
  21. It occurred to me that I haven't shared anything in a while. So, I'm going to post up some pictures of some rocks I've cut. Mookaite, Australia. Imperial Jasper, Mexico. It's got a volcano in it! A Dark and Stormy Night. Imperial Jasper, Mexico. Polish flint.
  22. Volcanic Flint

    And also yes, that piece could make some very beautiful points.
  23. Volcanic Flint

    Large round bubbles are a characteristic of man made glass, but not of obsidian. There is a very large bubble in the lower left portion of your piece, and several hundred smaller bubbles to the right. Any bubbles found in obsidian are typically microscopic and elongate rather than round.
  24. It might be opal, but in the pictures looks like it's probably the chalcedony variety of quartz. Very hard to say for certain from pictures alone.