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d_day last won the day on November 18 2015

d_day had the most liked content!

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About d_day

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    Old Gold, Old Rocks, Old Cars.

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  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.