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4meter

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4meter last won the day on December 31 2020

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

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  1. The services of a professional assayer would be the next step if the original poster would like to know if there is anything of value and how much per ton. The samples my be just pyrite with minor amounts of other metals; just enough to produce other colors in the sample beside the normal brassy color of pyrite. I have pulled samples of pyrite from the ground that looked "silver".
  2. Well, based on what we know so far, and after consulting my minerology books; I would place this sample in the arsenic sulfide group. Maybe Arsenopyrite (best fit so far), Cobalite or Skutterudite (that really is a mineral name). All of these have a metallic luster, gray-black streak, silver gray to silver white color, 4.5 to 6 Mohs hardness, not fusible, will not react with HCl, all tend to be massive in sample view. Now, if we had some nitric acid and could do a bead test, we could pin it down to one of the above.
  3. We can run out stibnite; would have fused easily at the tips of the sample. For future reference, when doing a fusion test, use a sample that is just big enough to be handled with by tweezers. Strike the sample with hammer to see if there is a garlic smell. If you have a piece of unglazed porcelain, rub the sample against it and then smear out the streak out. Take a clear photo to show us. A hardness test would be helpful. Do you know how to do a Moe's hardness test? You have tried Hydrochloric acid to dissolve it with no reaction. Do you have some sulfuric acid (battery acid)? If so, carefully, & out side, see if a small sample with dissolve in a small bit of battery acid (a few sample grains 1/2 the size of a BB & 3-4 eyedropper drops of acid) The other acid used for testing is nitric acid, but most do not have access to nitric acid. Can you tell us what county/town, in Calif the location is near? That would help narrow things down without giving away the location.
  4. If it is/has stibnite in it, easy way to tell is to take a small splinter in the flame of you r lighter. If stibnite is present, the splinter will fuse or turn into a melted ball. Stibnite has the lowest fusion temp of nearly all minerals. On the geo fusion scale, stibnite is 1. I agree with another, this looks like a massive sulfide deposit. Could also have arsenic in it. Rub against a hard metal an see if a "garlic" odor is present. If it does, it has arsenic. If you try the fusion test, see if you detect a "sulfer smell" from the sample. If you smell sulfur, its a sulfur salt.
  5. Research the "laminated brown ores (iron) of Texas. The specimen does look like an example of sedimentary iron ore formations.
  6. Hello Dilla1080, I believe you have a sedimentary rock with "molds" created by "load casts" features. From the photo # 4 it is clearly shown that there are alternating layers; some look like sandstone others shale. When the sediments were deposited as sand (sandstone) & mud (shale) a denser, thicker sand layer, which was rapidly deposited over the muds, sank into, and displaced the muds. This created the pattern seen in photo #1 & #2. Later the whole sequence was "cemented" together into a solid rock layer. Erosion has exposed the rock and we now see the "molds" or "holes" in the lower layers in which the sand sank into. The sand has been removed by erosion or broke away from this layer when the rock weathered out of the rock layer. Its a very nice rock you have there.
  7. Maybe a sapphire; could also be tourmaline or blue plagioclase feldspar. Do you know how to do a hardness test? Very nice pink/red minerals in the background. Looks like rhodochrosite. Did you find these?
  8. It's a soak um deal. 1 day & up to 1 week depending on material and how much iron staining. I.O. also gets out "Wad" staining to.
  9. The rock the mineral is found in is a metamorphic rock. Maybe a phyllite or low grade schist. I suspect the mineral shown is hornblende, but would no rule out staurolite or tourmaline.
  10. I have heard of Yooperlites before, but not of Omars. Thanks for sharing the link about these rocks Stillweaver!
  11. Its not a meteorite. From the video alone, I cannot tell what type of rock this is. Can you can supply us with some clear, close up photos? Its a very interring rock.
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