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Demsa
Basic information Name: Demsa
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes
Year fell: 2006
Country: Nigeria
Mass:help 5 kg
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  H6
Recommended:  H6    [explanation]

This is 1 of 5782 approved meteorites (plus 3 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 26 Jul 2014
Writeuphelp
Writeup from MB 103:

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 μm, 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.

Data from:
  MB103
  Table 0
  Line 0:
State/Prov/County:Adamawa
Date:2006 Oct 31
Latitude:9.4559°N
Longitude:12.1526°E
Mass (g):5000
Pieces:1
Class:H6
Shock stage:S2
Weathering grade:W0
Fayalite (mol%):19.1-19.4, n = 3
Ferrosilite (mol%):16.5-17.2
Wollastonite (mol%):1.7-1.3
Classifier:A. Irving and S. Kuehner
Type spec mass (g):20.7
Type spec location:UWB
Main mass:E. Twelker
Comments:Submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography:

Nigeria
Coordinates:
     Recommended::   (9° 27' 21"N, 12° 9' 9"E)

Statistics:
     This is 1 of 2 approved meteorites from Adamawa, Nigeria
     This is 1 of 20 approved meteorites from Nigeria
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