[meteorite-list] Met Bulletin Update - NWA 8161 Martian
Galactic Stone & Ironworks
meteoritemike at gmail.com
Thu Dec 26 18:57:30 EST 2013
Seasons Greetings Bulletin Watchers,
There is a recent update to the Met Bulletin. The new approval is NWA
8161, a poikilitic shergottite.
Link - http://www.lpi.usra.edu/meteor/index.php?code=58489
Write-up :
Northwest Africa 8161 (NWA 8161)
Morocco
Purchased: 2013
Classification: Martian meteorite (Shergottite)
History: Purchased by Aziz Habibi in Morocco, 2013.
Physical characteristics: Several fragments that fit together to form
a nearly complete stone. Shiny black crust, broken surface reveals
polycrystalline texture with millimeter-sized grains
Petrography: (C. Agee, UNM) Microprobe examination of a polished epoxy
mount shows ~40% olivine, ~40% pyroxene, ~10% maskelynite, ubiquitous
Cr-Ti-Fe oxides; sulfide present. Pyroxenes and olivines are heavily
shocked, grain size ranges from 200-2000 μm.
Geochemistry: (C. Agee and N. Muttik, UNM) EMPA. Olivine Fa40.1±3.7,
Fe/Mn=52±1, n=12; pigeonite Fs28.6±2.7Wo9.7±2.7, Fe/Mn=30±1, n=23;
augite Fs19.4±1.9Wo32.0±4.4, Fe/Mn=27±1, n=9; maskelynite
Or2.3±0.4Ab47.2±3.0An50.5±3.2, n=8.
Classification: Martian meteorite (shergottite, poikilitic)
Specimens: 20.5 g including microprobe mount on deposit UNM, Aziz
Habibi holds the main mass.
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Best regards and Happy Huntings,
MikeG
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