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119.7 gram full slice.   Ureilite

Hanno writes:

NWA 10870 - Ureilite melt rock

Here is a meteorite with a classification so unique it has never been heard of so far. It’s a one-of-a-kind ureilite. It is "shock molten" and thoroughly recrystallized. The recrystallized grains are so fine that the grain size can only be recognized under high magnification (see photo 4, taken with an electron microscope). That’s why you don’t see the usual, colorful minerals when viewing the thin section in cross-polarized light. It is only a few minor areas displaying minimal color changes – another hint for the extraordinary nature of this material.

  Click to view larger photos     #1     #2     #3     #4     #5     #6

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