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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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    Silver Member

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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. 4meter

    Wondering what these are

    I saw a sample of Malachite the other day that was an exact duplicate of your green mineral; very nice! For the blue carving, it is Lapis Lazulite. clay is also correct since the mineral Sodalite gives Lapis Lazuli (rock name not mineral name) its blue color. Rounds for everyone!
  2. 4meter

    Help identifying

    Diggingd, I believe that your ID of the samples is correct.
  3. 4meter

    Help with ID please.

    I agree with Morlock. Looks like a fossiliferous limestone that is weathering unevenly due to different difference in the material that makes up the rock.
  4. 4meter

    new member cool find, need ID

    I second Morlock's ID.
  5. 4meter


    Its a superficial resemblance to a Coprolite but I think it is an oblong piece of gray limestone with some sort of filling (pink stuff). Very nice collection you have there Birdbrain. Did you find all of it, inherit some or a combination?
  6. 4meter


    Welcome Birdbrain! The last pic in you first group of photos is called a "Coprolite" Coprolite - Wikipedia. That's a paleontologist word for petrified poop. A cool find!
  7. 4meter

    So I thought this was cool!

    "Opal is not really a mineral per se. It started as organic material. " Its true that opal is not a mineral in the strict definition of what a mineral is. However, the "started as organic material" part is not correct. Opal does not form solely from organic material. It is true that some organic material can become opalized like wood, or bone but opal forms in bare rock too. Its all about the correct mix of silica, water and temperature under the right conditions for opal to form. Organics need not apply. Opal - Wikipedia
  8. Boy, this groups sees "opal" everywhere they look. LOL. Hardness of 6-6.5, conchoidal fractures, purple color all that cries out as Amethyst Quartz. All opals have water in the chemical composition. By definition the water content is what makes an opal, otherwise its just another piece of quartz. Two test can be performed to ID this sample as an opal: 1) place sample under a shortwave, UV light, if it glows dim or bright green its an opal; or 2) (need to know to perform this test properly) crush a small sample of the mineral and place in a "closed tube" then heat with a Bunsen burner, if water condenses in the upper (cooler) port of the tube then you have IDed the sample as an opal.
  9. The sample sticking strongly to a magnet would make me say you have a piece of quartz (white stuff) with magnetite (black stuff) in it.
  10. 4meter

    Can somebody help me?

    The large white pieces are "milky" Quartz. The hexagon sample could be one of several minerals. Can you get us a clear pic of the sample on its side? Will the hexagon sample scratch the pyrite or quartz? Will the quartz or pyrite scratch the hexagon sample?
  11. 4meter

    Another "What is it".

    My best guess is that the rock is a "sandy conglomerate". The supporting matrix of the rock is composed of "sand" sized particles and these support the well rounded larger pebbles; all of the material is well cemented together probably by quart. Most likely a stream deposit that was later covered by basalt flows. It is very common to see these type of rock layers here in the southwestern USA.
  12. 4meter

    what type of rock is this

    I'm with d-day on this one; pegmatite with Biotite mica.