[meteorite-list] Introducing Thumb Butte

[Meteorites USA]

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                          35º 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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