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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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    Male
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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. Last 5 photos are slag. Red rocks look like saprolite (highly weathered "rotted" rocks); one has some green copper mineral on the outside. White rock is a Gniess (metamorphic rock). First photo looks to be either a mineralized ore or a igneous rock that has has been changed mostly into the mineral Chlorite and wad (black magnesium,manganese and others). Second photo looks like the Gniess that has been changed into Chlorite and other minerals. All together the rocks speak of an area that once had geothermal activity. Very nice!
  2. Your color photos clearly show shades of green, pink (your brown?) and black. The colors might be more apparent to the eye when the sample is wet and/or polished.
  3. Looks like a large piece of "Unakite" the common name used for a pink (Feldspar) & green (Epidote) granite found in the southeastern mountains. This piece appears to contain a fair bit of Magnetite and the photos seem to show a dark "glassy" mineral on the surface I suspect is smoky quartz. A very interesting rock to look at. Here is a link to the wiki page for Unakite
  4. Jake, you are going into the realm of optical mineralogy with that thin slice and tiny minerals. That is far beyond the ability of a forum like this. Your best bet is to take it to a university and hope a grad student is willing to help pay big bucks to a professional mineralogist. Personally, I think calling the sample it Quartz is sufficient.
  5. I was thinking either paint or chalk. The rock looks to be limestone.
  6. Its a piece of sandstone (rock type) that is naturally stained with most likely a magnesium or manganese mineral. Sandstone is a very common, sedimentary rock, in parts of MN.
  7. Your streak of the inner portion of the black rock said it all, Pyrite and maybe some minor Chalcopyrite which confirms the minerals seen in your photo. I have no idea if your purple rock is mineralized.
  8. I'm with d-day. I bet it comes back as a horn coral on fossil bearing limestone. There could be some replacement of the calcite with quartz. That happens quite a bit.
  9. I would not rule out green Microcline as a possibility. The last photo shows nice "twinning" of minerals, a major characteristic of microcline. There also appears to be some cleavage showing in the other photos. This is a very attractive mineral. Nice find!
  10. Photos are blurry but looks like Pyrite to me.
  11. I dought there is any economic metals in that lump. The holes and refined metalic surface of the sample lead me to believe that this is a piece of left over furnace pour, "metallic slag" for lack of a better word. I'm sure the folks in the foundaries have a word for it. It is not a mother nature made mineral or rock.
  12. There is dark green and purple minerals in there as well. What is it now?
  13. I think Diggingd is spot on the ID of the sample. Your sample looks very much like the small pieces of Fire Agest from S.E. Arizona
  14. Interesting find. I think the term for all the fossil pieces is "hash" such as "trilobite hash", or "coral hash" etc..
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