[meteorite-list] Met Bulletin Update - NWA 8161 Martian

From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Thu, 26 Dec 2013 18:57:30 -0500
Message-ID: <CAKBPJW_2xGyNEygJd5yKh_7k59Wynw1TRD6hOjyb1TRBbP-mqQ_at_mail.gmail.com>

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 ?m.

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.

---------------------------------

Best regards and Happy Huntings,

MikeG

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Received on Thu 26 Dec 2013 06:57:30 PM PST