[meteorite-list] New 2006 Fall - Demsa Nigeria

From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Sun, 27 Jul 2014 10:26:14 -0400
Message-ID: <CAKBPJW9gHBLnw26GCJFe=U2gzR3Hujj6HX83makgLtcn6SaZ-A_at_mail.gmail.com>

Hi Fall Followers,

There is a new witnessed fall in the bulletin - Demsa (Nigeria, H6, Oct 31 2006)

Link : http://www.lpi.usra.edu/meteor/metbull.php?code=60272

Write up :

Demsa 9.4559?N, 12.1526?E
Adamawa, Nigeria
Fell: 2006 Oct 31
Classification: Ordinary chondrite (H6)

History: On October 31, 2006 between 10 and 11 am, local time, a sonic
boom and change in sky color frightened local residents in Adamawa
State. Nigerian authorities were alerted and the incident was reported
on Nigerian television. Three meteorite individuals totaling 4 to 5 kg
were subsequently recovered in and around the village of Demsa. The
reports came to the attention of meteorite hunter, E. Egbe of Kaduna,
who traveled to the location and was able to purchase one crusted 980
g individual stone. This stone had been struck with a hammer, and the
reassembled mass (consisting of five pieces totaling 959 g) was
purchased by Twelker in April and July 2007.

Physical characteristics: A single fresh, gray stone (959 g) with
glossy black fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS) Fresh specimen containing
sparse chondrules (mostly 0.7-1.4 mm, some up to 2.5 mm) in a
coarse-grained matrix rich in holly-leaf shaped metal grains.The
matrix plagioclase ranges in size from 100 to 300 ?m, and accessory
troilite and merrillite are present.

Geochemistry: Olivine (Fa19.1-19.4, N = 3), orthopyroxene
(Fs16.5-17.2Wo1.7-1.3, N = 4), clinopyroxene (Fs5.4-5.5Wo46.4-46.0, N
= 2).

Classification: Ordinary chondrite (H6).

Specimens: 20.7 g of sample and one polished thin section are on
deposit at UWB. The main mass is held by Twelker.

Recent falls page : http://www.galactic-stone.com/pages/falls

Best regards and Happy Huntings,

MikeG

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Received on Sun 27 Jul 2014 10:26:14 AM PDT