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4meter last won the day on January 26 2016

4meter had the most liked content!

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About 4meter

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    Tucson, Arizona
  • Interests
    rock/mineral/fossil collecting; geology; meteorology; astronomy; sailing; good food; wood working; afternoon naps.

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  1. Another oddball?

    That should be guide to Vermont not NH. Sorry about that.
  2. Another oddball?

    Here is a rock/mineral hunting guide to NH. This will help you as you collect. On page 42 there is a rock sample that, with some weathering would be a dead ringer for your sample. If so, you have a talc, actinolite schist. The elongated, Actinolite blades would be hard (5.5 on mohs scale) compared to the Talc matrix around them that should be soft (2.5 on mohs scale).
  3. Another oddball?

    Take a brass brush to a side and clean it up. That might help in IDing the minerals that make up the rock.
  4. Odd rock help?

    Thank you NHrockhunter for the additional info. This is a hard nut to crack. Based on the photos and quick check on the geology of central NH, I think you have a heavily weathered piece of ultramafic dike rock. It fits the description in having a glassy matrix with small "needle" like crystals embedded in the matrix with mini/micro magnetite crystals. For a more exact ID, it would require either finding a geologist that is very familiar with the rocks of the area were this sample came from or giving it to a University willing to do a thin section analysis for you. If you get more info on the sample, please let us know. I would love to know exactly what it is.
  5. I'm pretty sure you have a Serpentinite sample. It was a Basalt that has been metamorphosed into the rock you now have. As other posters pointed out it contains Dendrites. These are manganese minerals that look like plants on the rocks surface. Its a very nice sample.
  6. Is this petrified wood?

    Give the rock a good bath and scrubbing in baking soda water. This will help remove the clays. I would give the sample a few days soaking in iron out solution as well. Use a plastic scrub brush then genitally use a brass brush. It should be easier to see what it is made of once clean. Post some photos of the cleaned rock.
  7. What kind of rock is this?

    Going solely by the photos, I would call it a water worn, Granite or Granodiorite pebble.
  8. Odd rock help?

    Need more input. Hardness? streak? Does it fizz if you put warm vinegar on it? does a magnet stick to it? where was it found?
  9. Another oddball?

    Doesn't look like it has "amber gems" to me. Looks like a greenish gray rock with minerals. Based solely on these photos I would go with the rock type as Lamprophyre and the minerals seen being hornblende or actinolite. Use a brass brush and clean a small corner to see what it looks like cleaned. Where did the rock come from? knowing the local geology would be a big help.
  10. Then again, it might me just a weathered piece of Basalt. That would also account for the green crystals (possibility Olivine) seen in the sample.
  11. Well the "metallic" color left on the sample by the " fancinia" (don't know what that is) means the sample is harder. I'm wondering if this sample is black because of "Desert Varnish". I read that over in the desert of southern California in the 1800s, there were large gold nuggets scattered about on the desert floor but no one payed attention to theme because they were coated black by "Desert Varnish". Maybe if you take a rotary tool with a small wire brush, you can brush off a small corner to see if the black comes off. The white rock in the last series of images is a piece of milky quartz with some iron staining and Muscovite mica on it.
  12. Turquoise?

    Need more input. Hardness, streak, fizz with warm vinegar?
  13. Looks like Magnetite to me. Take a magnet and see if the magnet attaches to the sample. If it does, most likely Magnetite. It does not rule out an iron meteor, but that need lab work to determine and this sample does not look like other iron meteor samples that I have seen.
  14. Ricolite, never heard of it until now but a quick Google and a variation of Ricolite (Serpentine) would seem to fit the bill s far as hardness, massive texture and the foliation that the sample displays. Ricolite is more green with white streaks, but nothing says it cannot be yellow with green stripes. Ha, maybe you can name it Yicolite, radssmith. LOL!
  15. Hard to believe that your fist photo and the last are of the same stuff, COOL! I'm going with Meta-Quartzite with some green stuff. Way to may minerals that green to venture a guess based solely on a photo. LipCa, very nice Gniess(s)!