[meteorite-list] Met Bulletin Update - Timber Lake USA, and Two NWA's (Type 3's)

From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Wed, 6 Mar 2013 15:36:51 -0500
Message-ID: <CAKBPJW8dpu97BmaTukd2G2sOpiTWKixXoP4dTydYBCHgi1pQBA_at_mail.gmail.com>

Hi Bulletin Watchers,

3 new approvals in the Met Bulletin today. One is a find from South
Dakota, and two are type-3 chondrites from Morocco.

Link - http://www.lpi.usra.edu/meteor/metbull.php?sea=%2A&sfor=names&ants=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&snew=2&pnt=Normal%20table&dr=&page=0


Here is the write-up for Timber Lake :

Timber Lake 45.425?N, 101.097?W
South Dakota, USA
Found: 2011 May
Classification: Ordinary chondrite (H3)

History: Found by Mr. Richard Scherer in 2010 while he was checking
part of a farm field that appeared to have been dug out by a badger.
The find location is about 1.85 km west of Timber Lake in Dewey
County, South Dakota.

Physical characteristics: A single, dense, dark brown stone weighing 8660 g.

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed, small
chondrules and fairly abundant altered metal. Minerals are olivine,
orthopyroxene, clinopyroxene, sodic plagioclase, chromite, troilite
and kamacite (partially altered to iron hydroxides).

Geochemistry: Olivine (Fa14.6-44.2; median Fa18, N = 12; Cr2O3 in
ferroan olivine = 0.02-0.12 wt.%, mean 0.05 wt.%, sd 0.04 wt.%, N =
8), orthopyroxene (Fs16.1-18.2Wo1.11.7; core Fs6.9Wo4.6), augite
(Fs6.0Wo45.6), pigeonite (Fs45.3Wo9.5).

Classification: Ordinary chondrite (H3).

Specimens: A total of 20.9 g of sample and one polished thin section
are on deposit at UWB. The main mass is held by RScherer.


Best regards,

MikeG

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Received on Wed 06 Mar 2013 03:36:51 PM PST