There are many spheres in thin section
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Thread: There are many spheres in thin section

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  1. #1
    cn
    Apr 2020
    26
    18 times
    Meteorite

    Question There are many spheres in thin section

    A. I found it in the desert of Xinjiang.

    B. The mass is 1532g and the density is 3.4g/cm3.

    C. No magnetism.

    D. I cut it into thin section and observed it under a microscope.

    could it be a meteorite?

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  2. #2
    cn
    Apr 2020
    26
    18 times
    Meteorite
    It can react with hydrochloric acid to form bubbles, probably containing carbonate, which is almost nonexistent in meteorites. Maybe it is an Oolitic Limestone.
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  3. #3
    cn
    Apr 2020
    26
    18 times
    Meteorite
    It seems to be affected by some kind of external force to form a black vein, which breaks down some spherules.
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    Thin section,Natural light.

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    Thin section,Area A is magnified by 40 times,plane-polarized light.

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    Thin section,Area A is magnified by 40 times,cross-polarized light.
    DizzyDigger likes this.

  4. #4
    cn
    Apr 2020
    26
    18 times
    Meteorite
    There are also two suspicious places: There seems to be olivine crystals in area B (the blue gray part under orthogonally polarized light), and there appears to be a vesicle in area C (seems to be a kind of glass, which is completely black under orthogonal polarization).
    Recent news reports suggest that there is carbonate on the Bennu asteroid.
    Ask the master's advice. Is it possible that it is a meteorite?
    Click image for larger version. 

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    Thin section,Natural light. Areas A, B and C are marked with blue boxes.

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    Area B is magnified by 100 times,plane-polarized light.

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    Area B is magnified by 100 times,cross-polarized light. The blue gray part appears to be olivine crystals.

    Click image for larger version. 

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    Area C is magnified by 40 times,plane-polarized light.There appears to be a vesicle in area C.

    Click image for larger version. 

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    Area C is magnified by 250 times,plane-polarized light.There appears to be a vesicle in area C.

  5. #5
    cn
    Apr 2020
    26
    18 times
    Meteorite
    This is a strange stone, obviously not chondrite, It contains a lot of carbonate,but there seems to be evidence of impact. I found two melt pockets in the thin section, which containing flow-cooled glass.

    Click image for larger version. 

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    a、c,plane-polarized light,b、d,cross-polarized light

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    a、b、c、d,plane-polarized light
    roy2bears likes this.

  6. #6
    cn
    Apr 2020
    26
    18 times
    Meteorite
    I made another thin section from the same stone. Pyroxene seems to have melted in the thin section.

    Click image for larger version. 

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    The thin section

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    plane-polarized light

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    cross-polarized light

 

 

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