Roll Overs:
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Copyright (c) Steve Brittenham.
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38.6 grams. 40 x 37 x 23 mm. H5
Observed fall March 5, 1960, in Burkina Faso.
From Wikipedia:
TKW probably over 1,000 kg. After three separate detonations, several thousands of stones rained down over an area of about 70 square kilometres (27 sq mi). The sound of the fall was heard as far as Ouagadougou, which is 100 kilometres (62 mi) away. Eyewitnesses said that some trees were broken and henhouses destroyed. The largest stones recovered weigh up to 10 kilograms (22 lb).
Steve writes:
Gao-Guenie is a well-known fall and consequently doesn’t require much in the way of explanation. This particular example was given to me several years ago by Edwin Thompson of E.T. Meteorites. It’s not as large as some of the other Gao-Guenie MPOD submissions, or even as unusual as, say, Gary Fujihara’s unique 13.8 gram oriented stone with “hitchhikers” from 11/3/2011, but it does have a couple of nice features that I thought made it worth submitting. It’s obviously oriented, and similar to my prior Murchison submission, apparently never tumbled, so the center portion of the backside is relatively undisturbed. While this piece purportedly came out of the Gao-Guenie strewn field, its interior does not appear consistent with other examples I’ve seen; that said, Gao Guenie is a breccia, so I’m guessing there was enough variation in the parent that it’s just a less common lithology. The first photo depicts a fairly uninteresting leading edge; the second photo includes a few shots of the backside from different angles and with different lighting to show some of its features: frothy rollover lip, significant amounts of metal, and a surface appearance that for some reason makes me think of the moon. |
Click to view larger photos #1
#2
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Found at the arrow (green or red) on the map below
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Mike Murray 4/14/2021 1:19:09 PM |
That individual shows some elongated metal inclusions visible on the outside. Don't know that I have ever seen such before. Very cool piece. |
Mike Murray 4/9/2021 9:41:24 PM |
Interesting leading side with those lines in the crust but wow, that trailing side has it all going on. Pretty cool individual. |
Juergen / jnmczurich 4/9/2021 5:14:32 PM |
That is a really nice looking Gao-Guenie. Congrats! Thanks for showing us your very special collection sample |
Frank Cressy 4/9/2021 9:02:37 AM |
I love this Gao! I think that Gao is one of the most underrated meteorites out there, and your submission proves it. Thanks for sharing. |
John Divelbiss 4/9/2021 7:29:12 AM |
Impact melt Gao's certainly are out there. Some of us bought nice slices of it from Eric Olsen many years ago. And this one does look like a couple smaller Chely's I have. AWESOME ! |
Roberto Vargas 4/9/2021 6:30:12 AM |
Very interesting looking Gao, Steve! Thanks for sharing. |
Graham Ensor 4/9/2021 4:41:48 AM |
Reminds me a lot of some Chellies that are a portion of the matrix containing complete melt. Nice to see those large vesicles which probably contributed to the thick trailing crust popping off...have seen simmilar results with smaller vesicles on Chellies and many of those lost huge amounts of crust in the melt examples. |
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