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Everything posted by d_day

  1. Looks more like trilobite fragments to me. Either way, nice find.
  2. Well, if there are air bubbles, it’s most likely to be slag. I thought maybe copal or amber, but your heating of the piece eliminated those possibilities.
  3. Obsidian? In North Carolina? Not likely. There are no known occurrences of obsidian east of the Mississippi. The geology of everything east of the Mississippi is far too old for obsidian to exist. Any obsidian that may have been in the area would have long since degraded into perlite. As to the turquoise, well, none of those stones look anything like any turquoise I’ve ever seen. Turquoise has a hardness of 5 to 6, and a specific gravity between 2.6 and 2.9. Test your pieces and if they don’t fall into these ranges then you definitely don’t have turquoise.
  4. Looks like a piece of river polished quartzite to me.
  5. Looks like another pegmatitic granite.
  6. Might be vesicular basalt, but I think it’s most likely industrial slag.
  7. All that rust has me thinking it’s an iron bearing rock of some sort.
  8. I’m going to guess either low grade obsidian, slag, or common opal. All can only be guesses when there is no more information besides a photo.
  9. I’m almost wondering is this was formed in a similar manner to a septarian nodule. I doubt it, but I suppose it’s possible.
  10. I all seriousness, it looks like a bunch of river worn granite.
  11. If I had to guess I’d say it’s a photograph of some rocks.
  12. What’s their hardness on the Mohs scale? What’s their specific gravity? Where were they found? these are all things we should know. Those stones could be about a million different things, and without more information we are literally just guessing.
  13. Calcite and aragonite will both react to vinegar since they are both calcium carbonate. The difference is just in the way the molecules are stacked. Calcite has a trigonal crystal system whereas aragonite is orthorhombic.
  14. Let me preface this by first saying do not take my opinion as gospel, primarily because I’m uncomfortable giving it based on photos alone. I’d be more comfortable if I could see it in person. I think this is real. It’s a copper mineral called malachite. It’s deposited slowly over time. A piece like this has a uniform color on the surface when found in nature. Specimens like are ground fairly smooth and then polished. This exposes the different layers giving it the concentric rings. This is something they do to specimens that are too thin or uneven to cut into slabs.
  15. I don’t think you’ve got a boulder at all. I think you’ve got a clump of very hard dirt with some rocks and dead tree roots in it.
  16. I’ve wanted to cut some of that for years. Can’t seem to afford the stuff though.
  17. Yeah, most likely selenite, but might also be a number of borate minerals.
  18. Anything we put forward without more info than just the pictures is going to be a guess. The white portion is pretty obviously softer than the rest of the stone, since you can see deeper wear near the edges. The white part is not much softer than the rest though, since it’s barely eroded more than the rest. It might be from a half to a full point softer on the Mohs scale. Or it might even be the same hardness but appears to wear more quickly because it’s more crystalline than the rest. That being said, it looks a bit like a river worn jade with quartz veins. It also looks like it could be marble. There’s just no telling without more info.
  19. Identifying stones from photos alone is difficult. Do you have more information, such as hardness and specific gravity? Can you take some clearer photos, maybe a little closer? It would certainly help.
  20. Going to take a wild guess and say opal.
  21. Does it scratch with a fingernail?
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