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4meter

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Everything posted by 4meter

  1. Looks like a piece of heavily rusted iron, or maybe some naturally baked clay. Would need to see what the inside core looks like for a definitive guess.
  2. I think the others are correct, but it could also be the mineral Gypsum. Gypsum is very common in the dry desert SW. Hard to tell from the one picture. If Mica, then it will easily flake off in thin sheets; Gypsum will not.
  3. It is a metamorphic rock, called Schist. It has been tumbled in a creek or river into the round cobble you now have.
  4. Its a metamorphic rock (a Schist) with Garnet fragments. Its from Earth not space.
  5. These are very nice samples of the famous Texas Ironstone. The outer shell is Hematite, and the inner core is a mixture of Goethite and Limonite. This was extensively mined back in the late 1800s, and early 1900s as a source of iron. There are many USGS publication from the 1920s on the mines and the source of the Ironstones.
  6. Does not look like any mammoth tooth I have seen. I'm sure it is a piece of iron stained Sandstone with some grooves worn into it.
  7. It is an Agate, but I see no evidence of fossil coral in the sample. It looks like it would be beautiful when sliced and polished. First give it a few days to a week soaking in a solution of Iron Out and water to remove the iron staining on the outside. Afterward, if there is any green stains or obvious lichens or other bios on the sample, soak it in a closed container with straight ammonia, outside, for a week to remove the bios. Always follow the manufactured directions, and use PPEs in a well ventilated area. Do not use cheap ammonia from the dollar store.
  8. Based only on these photos, I would say photo #1 is a fine grain Granite; photo #2 is a Granite or Granodiorite, and photo # 3 is a Lamproite.
  9. The photos resolution is not enough to show fine details. I will go out on a limb, and say that maybe the whole sample is made of broken fragments of former sea creatures "shells" cemented together. This is called "fossil hash". Sample may be a limestone (type of rock).
  10. I don't see any fossils in the photos. Just a scuffed rock.
  11. Gemology: the study of labeling an worthless rock(s) to sale it for a small fortune.
  12. I like corundum; have not found any yet, but I would like to.
  13. Ruby and Sapphire are the deep red, and deep blue colored varieties of corundum. Just in case anyone wanted to know.
  14. I made a typo in my last post. It should read thus "Try the test again, and see if the Quartz "bits" into or gouges the test sample. If it does NOT," Sorry for any confusion.
  15. Hello Sketch, Your 4'th and 5'th pics look like corundum (same mineral as Sapphire, just not blue color) a non-precious aluminum oxide mineral. Your last photo seems to shows Quart powder on the sample. Try the test again, and see if the Quartz "bits" into or gouges the test sample. If it does, the sample is harder than Quart. I would say that you have samples of Corundum.
  16. Interesting. It looks like a cast of a type of conch shell, with partial cast of the inner whirls of up to two separate shells.
  17. None of these are fossils. They are are all recent (modern) material. The first pic is a modern coral fragment, the rest is bone of a mammal.
  18. The fossil does not have the five fold symmetry of a Crinoid, Blastoid or other Echinoderms. Might be a sponge of corral of some sort. Based on the fact that both the big and little fossils have a hole in the middle, that was filled with matrix, and inner/outer walls with pours, I would call these sponges.
  19. Would not be Scheelite; Scheelite is not magnetic and does not have a metallic luster to it. This sample is magnetic and has a metallic luster on the fresh surface. Looks and fits the description of Magnetite. I also agree with Bob that the mineral on the side is iron stained quart. Did you find the sample in Central or Northern AZ?
  20. That's a beauty of an rock you have Bob! Looks like it is made up of labradorite. The fibrous mineral(s) could also be Rutile. Did it come from New Mexico?
  21. Sketch, your last sample photo appears to show the mineral Sillimanite (white minerals). It is a real beauty if it is Sillimanite.
  22. Notice that the the matrix pieces have corners, slightly rounded at the tips but still corners. That makes the rock (among other things) a Breccia.
  23. Kimberlite is not the same rock type as a Lamproites; different geneses, and depth of fluid origin. I can see this sample being a weathered lamproite. I would not rule out a weathered massive sulphide ore either. We defiantly need a streak test of an unweather surface of the sample on an unglazed, porcelain, plate.
  24. How about some provenience? Where did the sample come from, who collected it, or was it bought at a shop?
  25. Looks like polished calcite and quarts with a peppering of other things to me. Try some warm vinegar, see if anything fizzes.
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