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4meter

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Everything posted by 4meter

  1. The round fossil pieces are from crinoids and/or blastoids I also see some gastropods (snails) & brachiopods (shell "fish"). The sample is organic rich which is way it is nearly black and has some iron staining likely due to minute pieces of pyrite within the sample that are weathering out. Pyrite is very common in organic rich rocks.
  2. Very nice rock egg! My guess is a biotite rich granite. I see some dark "purplish" colored minerals which could be garnet. The presence of garnets indicates some metamorphism so it could be Gneiss.
  3. 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!
  4. 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.
  5. 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
  6. 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.
  7. I was thinking either paint or chalk. The rock looks to be limestone.
  8. 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.
  9. 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.
  10. 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.
  11. 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!
  12. Photos are blurry but looks like Pyrite to me.
  13. 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.
  14. There is dark green and purple minerals in there as well. What is it now?
  15. 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
  16. Interesting find. I think the term for all the fossil pieces is "hash" such as "trilobite hash", or "coral hash" etc..
  17. Very nice find! I love your display, simple and elegant.
  18. Baste on one photo - looks like the mineral Biotite to me. Maybe a Biotite Schist (rock type).
  19. Yes that is correct about "smokers", but there are many low grade metamorphised "smokers" in the Appalachian Mt. chain. The old massive sulfide/copper depoits of southeastern TN are a prime example. So it is possible this "smoker relic" could have been found in the Mts. then sold and made its way to the fishpond. Of course, this is all guess work on my part.
  20. No way its a Molybdium, Galena or Zinc ore. Im going with Obsidian.
  21. With the new photos I'm very confident that it the predominate mineral is Epodoite and the rock type is an Actinolite (metamorphic rock type).
  22. Speleotheme is out. The sample appears to be Quart (agate), built up over time as individual deposits around something(s) & that something(s) desolved at some point then the sample was exposed to weathering to produce what we see now. I wonder if these formed underwater around "black smokers". Sea water has lots of silica, in certain areas, that would come out of solution around the "smokers" whle they are active. The minerals in the middle of "smokers" is usually soft (Mohs 2.5-4) and weathers quickly once the "smoker" stops. This combination could produce what we now see. Any other ideas?
  23. That is some very nice petrified wood you found and the minerals are very nice two. Excellent finds!
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