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  1. On the second rock the red mineral looks to be K-feldspar, green could be epidote.
  2. Its a coral of some variety, got a lot of of it here in Wi as well.
  3. 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.
  4. Does a magnet react to the black one? also try doing a streak test on it.
  5. like mentioned do streak test, hematite would leave a reddish streak.
  6. It is an attractive rock, colors are great. Could certainly be either Nephrite or Jasper though I would lean towards Nephrite based on the photos.
  7. yes back of a tile works. Try it in a couple different spots and see what you get.
  8. Interesting material, the second photo looks like a pebble of black basalt which it obviously isn't. I don't know of any other rocks/minerals that appear that opaque and are as translucent as your your first image posted. Neat.
  9. Could also be a feldspar or calcite based on the appearance of it, try to scratch it with a knife , feldspar and quartz wont scratch calcite will. The red portions could be iron oxide stains like Diggingd said, or another mineral tough to say based just on these photos. Not Amethyst though.
  10. Looks like one to me. These polish up nicely in my experience so that is a good option, and the fluorescent sodalite runs throughout the rock so no worries about sanding it away.
  11. Yes all the cherts/agates/fluorescent syenites came from the beach od lake Michigan.
  12. Some interesting things can be found here... Anorthoclase feldspar (moonstone) from Stettin pluton in Stettin WI, fluorescent sodalite in syenite (glacial deposit, foid syenite), geodes and agates, incredible looking chert nodules formed in limestone as well as the state rock red granite. Just thought I'd share some of what I have found recently.
  13. Is the blue spot always visible or only at certain angles when you rotate it? could be a schiller from labradorite or some other feldspar if it is seen only at certain angels. Unfortunately your camera is focusing on the background, try having a white sheet of paper behind it to create greater contrast, that might lock the focus in on the rock.
  14. Sorry, but that photo is not very helpful.
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