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Bob(AK)

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Bob(AK) last won the day on September 4 2014

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About Bob(AK)

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    Copper Member

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  • Gender
    Male
  • Location
    Anchorage
  • Interests
    outdoors, gold mining,rocks, hunting, fishing

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  1. Looks like Alaskan blizzard stone. If so a magnet will stick to it. It is a gabbro of feldspar crystals in a black serpentine material, my guess
  2. Does not look like serpentine to me, but as BMC said, serpentine is soft so check hardness. There are many green rocks
  3. I agree with Bedrock B, limestone with fossils. Try some vinegar or weak hydrochloric the limestone will fizz
  4. Usually carry .44 mag, certain places I carry a rifle
  5. What I call a nice piece of jasper
  6. first photo looks like agatized breccia
  7. How hard is this piece? Both chalcocite and covellite are quite soft and both will ring loudly on a detector. The top photo looks brown on the end is that so?
  8. agree with fuss, quartz, pegmatite looking
  9. Back to rock tumbling Bob. I am no expert, just the way I do this. As I said before I use nothing coarser then 220 grit silicon. Also use it on vibrating flat laps since coarser eats them up too fast. With tumbling I do use the 12 lb rotary tumbler for about a week with ceramic media to take up spaces. Then the sonic tumbler for 600 grit also with ceramic media (each step has its own ceramic) for about 4 days. Next the pre polish for 3-4 days and then the tin oxide polish with aluminum oxide pellets for 3-4 days. I have then added a burnishing step with borax for about 2 days using the same pellets as in the polish step. This last step removes any film that may be on the stones. That is what I now do but I am not telling anyone to do like this. PS. many of the vibrating tumblers are very loud. One made of rubber or rubber liner is much better. PSS> The Diamond Pacific Sonic tumblers are great except the small 3-4 lb containers don't work because the sides curve in and stones bind up. The 10 lb works fine. Perhaps they have redesigned the small ones, I don't know. Bob
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