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4meter last won the day on December 31 2020

4meter had the most liked content!

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About 4meter

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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. Research the "laminated brown ores (iron) of Texas. The specimen does look like an example of sedimentary iron ore formations.
  2. 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"
  3. 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?
  4. 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.
  5. 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.
  6. I have heard of Yooperlites before, but not of Omars. Thanks for sharing the link about these rocks Stillweaver!
  7. 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.
  8. You will never find the mineral olivine in a metamorphic rock. Olivine is only found in some basalt rocks. Since you found it in on lake Superior, I can say with certainty that the green material is the mineral serpentine. No need to find a Gemologist, this is not a gem. A very nice sample of serpentine. O! Greenstone, is an ancient basalt rock that has been metamorphized. I believe the Greenstones of Michigan are around 1.8 to 2.5 billion years old. They represent a time when the North American continent was tearing apart along its, then, western, northern and eastern par
  9. Like Bob said its a metamorphic rock. I believe the green vain material is the mineral serpentine.
  10. The black flaky minerals are biotite, the gray, "glassy" mineral is quartz, the yellow/brassy colored minerals that pepper the sample is pyrite and the flat yellow minerals are either muscovite or phlogopite. You are the proud owner of a schist (metamorphic rock).
  11. Is this the same sample as in first picture, just split open?
  12. Cool looking sample! Here are a few guess that might help pin it down. Massive augite, massive hornblende, anthracite coal & pitchblende (uranium ore), just to name a few common black colored minerals. The last one named, to test for uranium, put it next to your goldfish and turn off the lights. If the fish glows its pitchblende; just kidding!
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