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d_day

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Everything posted by d_day

  1. d_day

    A rock I found.

    It's just plain old glass. The bubbles are the telltale sign. Green obsidian is extremely rare, and almost always opaque. It never is as translucent as the piece you have.
  2. d_day

    What is this

    Auto finishes are pretty darn hard. Not sure where they land on the hardness scale, but I'd think they're at least as hard as calcite.
  3. d_day

    What mineral is this?

    Very difficult to tell from a photo alone. You have more info like specific gravity and hardness? if I had to guess (and that's all it would be) based on the photo alone, I'd say green calcite.
  4. d_day

    What is this

    I agree it's probably glass from a campfire. It certainly has the right look. It is always difficult to ID things from pictures alone, but this is a safe bet.
  5. Could also be basalt or basanite.
  6. d_day

    Geodes?

    I don't think any of those are geodes. I'm not saying they aren't, but they don't look like any I've seen or collected.
  7. And volcanoes create igneous rock, but not all igneous rock is volcanic. Magma is essentially lava that never reaches the surface. There can be magma literally anywhere.
  8. That piece looks like it's probably quartz. It's always hard to tell from photos alone though. As to giving you a bit of an education, I'll give you a little info. This first part is going to confuse you, but I promise, by the end it will make sense. Quartz and quartzite are both quartz. Quartz is igneous in nature. That means it formed from molten rock that solidified. As magma cools, the minerals in it begin to form crystals. The slower it cools, the larger the crystals can be. If the magma cools quickly, lots of smaller crystals form, and are mixed with other minerals. This is how fine grained granite forms. Generally speaking granites are composed of quartz, feldspar, and mica. It's difficult to pick out the individual minerals in fine grained granite. A slower cooling magma can form a type of granite called pegmatite. Larger crystals form in pegmatites and it's very easy to tell which mineral is which. The sample you posted in this thread appears to have come from a pegmatite. Sandstone is a sedimentary rock. That means it formed from sediments. Granites and other quartz bearing rocks are broken down down by various natural forces, eventually becoming sand. Sand can be a mix of minerals or composed almost 100% by a single mineral. When these sands are compressed over a long time, they become sandstone. When the sandstone is composed mainly of quartz sand, it's called quartz sandstone. Metamorphic rocks are rocks that have been changed by vast amounts of heat and pressure. Both igneous and sedimentary rock can become metamorphic. When quartz sandstone undergoes metamorphosis, it becomes quartzite.
  9. Is it worth anything? Not much really. Looks to be rather small. Large pieces sell for about $4 a pound. Smaller pieces sold as tumbling rough sell about $3 per pound.
  10. Yeah, I think it probably is bloodstone. At first glance, without zooming in, I'd have called it basanite.
  11. d_day

    Identify please

    Can you get us some better pictures?
  12. Can you take pictures in natural light on a dark background?
  13. d_day

    What Is This?

    You may have nailed it. I was firmly in the aventurine camp until I zoomed in. Now, if a knife blade fails to scratch it I'd say it's a chalcedony containing nickel or chrome.
  14. d_day

    Quartz Question

    Looks more like quartzite rather than quartz.
  15. Definitely brecciated, but metallic. I'm thinking hematite or magnetite, or some variety of pyrite. One of those things you just can't tell from a picture.
  16. I got the impression it was metallic, which really limits the things it could be.
  17. I can't really tell what it is, but zooming in on one of your pictures shows some very nice breccia.
  18. That depends on a lot of things. The quality of the stone is probably most important. If it's chalky or porous it won't polish well. If it's a good solid silica replacement it should polish beautifully. As for how to do it, well there's lots of different ways it can be done. Best bet would be to look up a local lapidary club and head down there. They can get you started on your way to doing something with it.
  19. Once it's been petrified it can fracture cleanly in any direction. It all depends on what stresses are put on it, and in what direction.
  20. Those look like natural fractures to me. It's not unusual for pet wood to fracture in such a way.
  21. I think you're right on most of those. I didn't zoom in on the second pic of #5 so I missed the cubic shape. 15 does indeed look like feldspar, but it also looks an aweful lot like travertine. Specifically the orange calcite out of Mexico. Still, I think you've bagged this one as well. I think 22 is actually the same stone as 14, oriented differently. and 25, well galena is the name I was searching my brain for when I came up with limonite. Again, I think you've got it. They can look quite similar, but the color and luster are right for galena.
  22. Ack, typos. 23 looks like rose quartz.
  23. 1, 3, 4, 5, 7-11, 16, and 21 all appear to be quartz crystals to me. 6 looks like azurite to me, but the lighting isn't very good. 12 is probably obsidian. 14 looks a variety of tourmaline called schorl. 15 looks like a hunk of travertine 18 and 19 appear to be varieties of pyrite 20 is a small geode The pink stone labeled 23 looks like Roseville quartz 24 looks like small schorl crystals in pegmatite 25 looks like limonite after pyrite 28 looks like fluorite All of these are of course opinions and not definitive answers as identifying minerals from photos alone is extremely difficult.
  24. Looks like a flint or chert nodule to me. Not likely a dino egg.
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