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4meter

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4meter last won the day on January 26 2016

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About 4meter

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

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  1. What kind of rock is this?

    Here is a candidate mineral: Alabandite a Manganese Sulfide, hardness of 3.5 to 4, black color, green streak, S.G. of 3.9-4.1, isometric crystal system which will give "pentagram" crystal faces. Alabandite is a member of the Galena group. What do the rest of you think? A positive test for manganese & sulfide would clinch it.
  2. What kind of rock is this?

    @ d_day: Augite would be a good candidate but the hardness of this sample is to soft at somewhere between 3.5-4.5 for Augite. I'm leaning toward some sort of copper mineral due to the softness and the green coloration on the sample. Still the S.G. is low for a metal salt mineral. @ poster: Can you give us a general area where you found the sample, I'm assuming its in eastern Pennsylvania.
  3. What kind of rock is this?

    Just to be sure, was the streak done on a "fresh" surface of the black colored mineral? Will the black mineral scratch a piece of copper? When you brake off a piece of the black mineral, do you get irregular, jagged edges or smooth edges with shapes that repeat? Last, if you hit a piece of the black mineral with a hammer, does it shatter into small pieces or does it flatten out like a piece of copper wire hit with a hammer?
  4. Identification?

    Basically, you have a nice collection of Quartz pebbles. The first photo looks like Quartz with some Epidote and some mica, second photo looks like milky Quartz with Jasper, next three photos are just Quartz & last photo is a piece of Quartz attached to what looks like an iron stained rock; might have some garnets in that rock based on a zoomed in, blurry view.
  5. Turquoise?

    Desertpilot: What a coincidence; I am going out to old Cortland this weekend to have a look at an exposure of the Pinal Schist and the over thrust faults of the area. The magazine article you posted above will make the trip more interesting. Thanks!
  6. What rock is this???

    A nice quartz, Geode. Do you have pics of the sides, top or bottom of this ample that you can post?
  7. Help identify?

    Try doing a hardness test on the red, green & white portions of the sample and report your findings. That will us a starting point.
  8. What kind of seashell is this?

    DANGER!! DANGER!! Will Robinson! its not a rock, mineral or fossil. How have we come to this lowly state?!
  9. What is the name of this stone?

    Adam, funny post above. Photos that are blurry are not useful. I think P.S. has a quartz pebble or cobble. Need a scale to know the true size of the sample.
  10. Rock identification

    Nice rock! Welcome to the Rock & Mineral forum Rockit. Most likely a glacial erratic, that is a rock dropped by a retreating glacier. Based solely on the photos, it is a Gniess; a metamorphic rock. There is some interesting minerals in the whitish, banded areas but the photos resolution is to low to allow for IDing. There is a fracture running diagonal through the rock that has been filled in by some whitish mineral.
  11. Another oddball?

    That should be guide to Vermont not NH. Sorry about that.
  12. 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).
  13. 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.
  14. 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.
  15. 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.
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