[meteorite-list] Osceola Meteorite is Official!

From: Michael Gilmer <meteoritemike_at_meteoritecentral.com>
Date: Sat, 2 Apr 2016 16:07:48 -0400
Message-ID: <CAKBPJW_ksp_R-hzqWuJWc2YYXTZsNRxEJddp0TqMUp8QnyMDDg_at_mail.gmail.com>

Hi Rob and List,

I can attest to the difficult terrain. I certainly picked a doozie for
my first meteorite hunt. Even though I have hiked much of Florida's
forests and backwoods, I usually avoid the swampy areas. I did not
have the luxury of avoiding swamp with this hunt. I brought my
hip-waders and managed to reach a few dry places that were surrounded
by water, but nothing was found. I am heading back before the end of
April for one last college try before I hang it up.

Did Arkansas Steve find anything?

Best regards and Happy Huntings,

MikeG


On 4/2/16, Rob Matson via Meteorite-list
<meteorite-list at meteoritecentral.com> wrote:
> Congratulations to Mike, Larry, Laura, Josh and Brendan for their
> aggressiveness in
> getting to the fall location quickly and their persistence in the face of
> very
> unfavorable searching conditions (SWAMP!) It is an impressive feat that
> anything
> was found at all, even with the nice radar returns.
>
> I have one correction: I'm pretty sure Larry was the second on the scene.
> Steve
> Arnold drove all night from Arkansas to arrive (I believe) the morning after
> the fall -- Monday, January 25. --Rob
>
> -----Original Message-----
> From: Meteorite-list [mailto:meteorite-list-bounces at meteoritecentral.com] On
> Behalf Of Michael Gilmer via Meteorite-list
> Sent: Saturday, April 02, 2016 11:00 AM
> To: Meteorite List
> Subject: [meteorite-list] Osceola Meteorite is Official!
>
> Osceola meteorite is official, approved by NonCom and entered into the
> Met Bull today - http://www.lpi.usra.edu/meteor/metbull.php?code=63109
>
> Osceola 30?27.16?N, 82?27.25?W
> Florida, USA
> Confirmed fall: 2016 Jan 24
> Classification: Ordinary chondrite (L6)
>
> History: (Mike Hankey, Larry Atkins, Laura Atkins, Josh Adkins,
> Brendan Fallon, Robert Matson, Marc Fries) On Sunday Morning 24
> January at 10:27 EST (15:27 UTC) a large daytime fireball streaked
> across the sky in northern Florida. Over 100 eyewitnesses reported the
> event to the American Meteor Society (Event 2016-266), describing a
> white sparkling head and plume of white smoke left behind. Fireball
> researchers Marc Fries and Rob Matson, found the American Meteor
> Society witness trajectory intersected with a group of radar returns
> that appeared shortly after the fall. The radar returns were strong,
> found at multiple altitudes and located on multiple stations: KJAX,
> KVAX and KTHL. Larry Atkins was the first on the scene. Mike Hankey
> arrived 5 days after the fall with Brendan Fallon and joined Larry and
> Laura Atkins in the hunt. On the 6th day, Mike Hankey found the first
> stone at 8.5 g on the eastern edge of the primary radar return. Within
> 2 hours Larry Atkins found the second stone (18.5 g) directly under
> the radar. The next day, two more stones were found: a 5.5 g stone by
> Laura Atkins and a 48.5 g stone by Mike Hankey. Six days later over 2
> miles away from the first find, an 839 g mass was found by Josh Adkins
> and Brendan Fallon. A week after that, Larry Atkins found the last
> stone, weighing 75.5 g. In total 6 stones were found over a three week
> hunting period for a total weight of 990.5 g.
>
> Physical characteristics: Thin, well formed shiny fusion crust covers
> the exterior of four of the stones, while two of them, the 43 g and
> the 839 g are matte black. This is likely due to submersion in wet
> sand and/or water prior to recovery. Some small rust spots are evident
> on some of the stones as well. Small regmaglypts are present on the 43
> g and the 839 g stones, and the remaining stones are irregularly
> shaped with little to no orientation. Some chondrules are visible
> through the crust. The interior of the meteorites are slightly
> darkened due to shock. Shock veins are present, some of which are
> black while others are filled with metal, appearing as long "strings"
> up to 3 mm long. Though most of the chondrules have been altered and
> are not well defined, some rare, large chondrules up to 0.8 mm are
> present.
>
> Petrography: Plagioclase grains are up to 100 ?m in size, consistent
> with type 6. No maskelynite was found. There are numerous
> chromite-plagioclase assemblages, consistent with moderately strong
> shock. Chromite grains are fractured. Troilite is polycrystalline.
> Metallic copper occurs as 2-?m-thick bands at the metal-troilite
> interface in an opaque assemblage. The chondrules are recrystallized
> and poorly defined. The only discernible chondrules are large ones,
> 800-1000 ?m across; these are BO and PO textural types.
>
> Geochemistry: Olivine Fa23.7?0.3 (n=21), Orthopyroxene
> Fs20.2?0.2Wo1.6?0.2 (n=14). Also present are small grains of diopside:
> Fs7.4 Wo44.9 (n=1). Plagioclase has a mean composition of Ab71.7?1.6
> Or8.8?2.5 (n=8); the low Na and high K values are a result of shock.
>
> Specimens: 21.8 g at UCLA
> ______________________________________________
>
> Visit our Facebook page https://www.facebook.com/meteoritecentral and the
> Archives at http://www.meteorite-list-archives.com
> Meteorite-list mailing list
> Meteorite-list at meteoritecentral.com
> https://pairlist3.pair.net/mailman/listinfo/meteorite-list
>
> ______________________________________________
>
> Visit our Facebook page https://www.facebook.com/meteoritecentral and the
> Archives at http://www.meteorite-list-archives.com
> Meteorite-list mailing list
> Meteorite-list at meteoritecentral.com
> https://pairlist3.pair.net/mailman/listinfo/meteorite-list
>
Received on Sat 02 Apr 2016 04:07:48 PM PDT