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fuss

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Everything posted by fuss

  1. Your purple rock is mica schist (purple mica is called lepidolite), I happen to have some samples from Australia myself. As far as the other stuff goes I'm not so sure what needs to be cleaned. If its dust/dirt covered you can rinse in and gently scrub in water. If you are trying to remove iron oxide stains iron out works well for that, for removing carbonate material you can try to remove with vinegar or stronger acids like muriatic.
  2. Microcrystalline and cryptocrystalline are synonymous terms, maybe you meant to say macrocrystalline Bob? Also for the OP, a hardness test would be most helpful, the first one posted looks like it could be Obsidian or common Opal but I think all of these might just be Chalcedony.
  3. First one could be a carbonate rock or maybe even a quartzite, tough to say unless you can do the test Morlock suggested. Though a hardness (scratch) test would also be a good idea especially on the large protruding mineral as well as the general surface. Second one looks more like quartz to me than Fluorite and a hardness test will be an easy way to determine that. A steel knife will scratch Fluorite but not Quartz.
  4. Sure looks like a quartz crystal, and I think the red you see is iron staining.
  5. Iron stained Chalcedony.
  6. Ivigo, If I were you, and was this intrigued by this rock, I would have it taken or sent somewhere for testing. That will be the only real way to satisfy your curiosity.
  7. I'd guess one of the Amphibole asbestos minerals based on the photo.
  8. could be a pyrite nodule, try scraping it against an unglazed white tile or the underside of the toilet tank lid and see if it leaves a mark (streak) and note the color of it. Pyrite would leave a black greenish streak.
  9. Chert nodule would be my guess.
  10. A few images from my collection. The first two images (same rock) are from Nelson Co. VA. I have another with inclusions of Rutile from that location. Both I purchased from a dealer in the mountains out there. The third image is one I found in northern Wisconsin in Langlade Co.
  11. Look at #17 on this list.I have a few samples one from VA and one I found in WI, Ill snap some pics in a bit and post. https://www.dmme.virginia.gov/dgmr/pdf/vamin/vm 48_2_3.pdf and this. http://geology.blogs.wm.edu/minerals-rocks-and-fossils/minerals/
  12. Looks like they turned out pretty nice. As far as jasper goes I would say #3 could be, but the other three look more like some kind of granite type rocks.
  13. The grey looks like it could be chert. Have you tested for hardness?
  14. d-day is 100% correct, these are very abundant along lake Michigan shorelines. Chrinoids, Favosites and several other things cemented up in limestone.
  15. My thinking is a basalt with a higher magnetite content. Try the streak test like Bob suggested.
  16. Actually a great find for southeastern WI, if you had said northwestern WI I would not have been surprised but these are few and far between in the SE part of the state, what town? Value is like what was mentioned above though.
  17. On the second rock the red mineral looks to be K-feldspar, green could be epidote.
  18. Its a coral of some variety, got a lot of of it here in Wi as well.
  19. Your probably right on your limestone assumption, though could be dolostone as well which is a bit harder. If you can get a good closeup photo of the crystals in the vugs that could help. The red area is most likely iron staining.
  20. Does a magnet react to the black one? also try doing a streak test on it.
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