MexicoDoug 11/11/2016 3:27:52 PM |
Thanks Hanno (with Paul's dedicated support) for sharing your beautiful high contrast photomicroscopy(?) image of this interesting piece of SS evolution. It is inspiring on a bleak and rainy day here to contemplate such a violent formation from a chair... and appreciate this rarity! |
Bernd Pauli 11/11/2016 9:00:00 AM |
Among the ureilites with a mosaicized texture that C.A. Goodrich mentions in Table 1 (p. 329) are the following: Goalpara, Y74154, ALHA81101, and LEW86216 * all of them highly shocked. |
A.V. 11/11/2016 6:26:53 AM |
From your images and reading the official classification I must say that I fail to see what feature, in this sample, it is that has never been heard of so far. For instance, Goodrich, C. A. (1992). Ureilites: A critical review. Meteoritics, 27(4) state that: "Several ureilites display a mosaicized texture with much smaller grain size which is probably a result of of shock brecciation and/or recrystallization". This in my opinion is exactly what we see here.
Congratulations on a nice ureilite sample though! |
Dirk Hohmann 11/11/2016 5:23:43 AM |
Very unusual ureilite. And thanks for a beautiful endcut of this number!! |
Graham 11/11/2016 4:51:29 AM |
Some of the dull looking ones can be the most interesting when you get up close...excellent! |
Bernd Pauli 11/11/2016 4:06:49 AM |
Wow !!! A "must have" for our collections. Thanks for sharing with us! |
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