[meteorite-list] Fw: Introducing Thumb Butte

From: Jack Schrader <schraderj_at_meteoritecentral.com>
Date: Mon, 25 Jan 2010 17:28:29 -0800 (PST)
Message-ID: <713050.5376.qm_at_web111007.mail.gq1.yahoo.com>

Congratulations Todd on the classification and naming of your cold find!? What a great name for a meteorite as well.... "Thumb Butte".? Way to go!



----- Forwarded Message ----
From: Wayne Holmes <holmesw at frontiernet.net>
To: meteorite-list at meteoritecentral.com
Sent: Mon, January 25, 2010 3:06:20 PM
Subject: [meteorite-list] Introducing Thumb Butte

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 08:28:29 PM PST