[meteorite-list] Met Bulletin Update - Sau 559 (Ureilite)

[Jim Wooddell]

 Congrats to JohnB and Laurence!  Nice!

Cheers!

Jim Wooddell


On Thu, May 16, 2013 at 8:15 PM, John Cabassi <john at cabassi.net> wrote:
> Thanks Mike. That is awesome and a big congrats to John. He's been
> very quiet lately, maybe he is still out on that same archaeological
> site.
>
> On Thu, May 16, 2013 at 8:00 PM, Galactic Stone & Ironworks
> <meteoritemike at gmail.com> wrote:
>>
>> Hi Bulletin Watchers,
>>
>> One new approval today.  It is an old Oman find from 2005.  Apparently
>> this ureilite was very stubborn and it chewed up several blades before
>> it could be subdued by the saw.
>>
>> Text -
>>
>> Sayh al Uhaymir 559 (SaU 559)        20°33.046’N, 56°39.336’E
>>
>> Al Wusta, Oman
>>
>> Found: Nov 2005
>>
>> Classification: Ureilite
>>
>> History: During November 2005, John Blennert found a 107 g meteorite
>> in the desert of Oman.
>>
>> Physical characteristics: Exterior of the stone is rough, with
>> preferential (wind?) ablation of the pyroxene over olivine grains.
>> Difficult to cut, requiring seven diamond blades and one week to slice
>> the stone in half. Surface of the polished thin section is rough.
>>
>> Petrography: Typical ureilite dominated by roughly equal proportions
>> of anhedral, fine- to medium-grained (0.5 to 1 mm) olivine and
>> pyroxene. No graphite visible in the thin section. Extensive reduction
>> of the olivine. Diamond abundant and confirmed by powder X-ray
>> diffraction. Diamond clusters to 20 μm visible with a reflected-light
>> microscope. Interstitial metal mostly altered to iron oxides.
>>
>> Geochemistry: Olivine and pyroxene more reduced than in typical
>> ureilites. Olivine cores have Fa5.2±0.1, FeO/MnO = 11.5±0.7, Cr2O3 to
>> 0.5 wt%, CaO to 0.3 wt%, n=13, rims to Fa0.5. Low-Ca pyroxene cores
>> Fs4.7±0.1Wo4.89±0.04, n=7.
>>
>> Classification: Ureilite.
>>
>> Specimens: 32 g and one thin section at ASU.
>>
>> Link - http://www.lpi.usra.edu/meteor/metbull.php?code=57462
>>
>> Best regards,
>>
>> MikeG
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-- 
Jim Wooddell
jimwooddell at gmail.com
928-247-2675