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d_day

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d_day last won the day on November 18 2015

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About d_day

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    Old Gold, Old Rocks, Old Cars.

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  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.
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