[meteorite-list] Introducing Thumb Butte

From: Meteorites USA <eric_at_meteoritecentral.com>
Date: Mon, 25 Jan 2010 18:33:26 -0800
Message-ID: <4B5E5476.3070101_at_meteoritesusa.com>

Congrats Todd! Great find.

Eric

On 1/25/2010 2:06 PM, Wayne Holmes wrote:
> Congratulations to Todd Parker on his new classification Thumb Butte.
>
> One nicely Oriented 104 g specimen H3.8 Chondrite. Todd found this
> specimen while hunting in the Bullhead/Laughlin area in Mar, 2008.
> This is the first of Todds 4 new cold finds to be classified.
>
> Check out the pictures on my website (first page, scroll down).
>
> http://www.meteoritesrock.com/index.html
>
>
>
>
>
> Thumb Butte 35? 10.196?N 114? 27.351? W
>
> Mojave County, Arizona, USA
>
> Find: 1 March 2008
>
> Ordinary chondrite (H3.8)
>
> History: Mr. Todd Parker found a 104 g stone on a small,
> alluvium-covered flat just west of Thumb Butte and 4 miles east of
> Bullhead City, Mojave Co., Arizona.
>
> Physical characteristics: The single stone is mostly covered by
> moderately weathered reddish-brown fusion crust.
>
> Petrography (T. Bunch and J. Wittke, NAU): Chondrules have sharp
> outlines with a mean diameter of ~0.4 mm. Matrix is slightly
> recrystallzed with some remnant calcic glass. Chondrule mesostasis is
> clear to turbid and several chondrules are armored with metal and
> minor FeS. Contains olivine, orthopyroxene, kamacite, FeS, taenite,
> merrillite, Cl-apatite, chromite and a trace of plagioclase. Fresh
> interior with reddish staining, weathering grade is W1. Shock level is
> S2.
>
> Mineral compositions: Olivine, Fa17.3 - 24; orthopyroxene, Fs15.7 -
> 19.1Wo 1.5 - 2.3; taenite Ni = 41.2 wt%; chromite cr# = 86.
>
> Classification: Ordinary chondrite (H3.8).
>
> Type specimen: 20 g are on deposit at NAU. Mr. Todd Parker holds the
> main mass.
>
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Received on Mon 25 Jan 2010 09:33:26 PM PST