Gujba

GujbaBogga Dingare, Yobe, Nigeria
Fall, At 18:30 local time, The 3rd of April, 1984
Bencubbin, CBa
Endcut 290,8g
Size: x x cm

History:
A conical meteorite fell in a corn field near the village of Bogga Dingare after a bright fireball was witnessed moving west to east and an explosion was heard. The local people hammered the meteorite into many pieces and most of the material was dispersed. The original mass is unknown, although second hand reports indicate that it had a volume of ~20000 cm3, and thus a mass of ~100 kg. Material that almost certainly came from this fall has been sold in the last few years elsewhere in Nigeria, with claims that the specimens were new finds. A preliminary description of the meteorite appears in Islam and Ostaficzuk (1988). Description (L. Karwowski), USil, based on the original mass): contains metal nodules, 1.5-8 mm in diameter, and silicate nodules 1-15 mm in diameter with fan like aggregates of pyroxene; 60% of the nodules are metal. Description and classification (A. Rubin and G. Calumny, UCLA, based on a 282 gram fragment purchased in 2000 near the village of Gidan Wire in Kaduna state): consists of large metal nodules containing variable amounts of troilite, and cryptocrystalline silicate spheroids; silicates include pyroxene (Fs1-2Wo1-3) and rare olivine (Fa3); siderophile abundance pattern in metal similar to that of Bencubbin: shock stage, S2; weathering grade W0. (From the Meteoritcal Bulletin No. 85, 2001)

Eric Twelker write about the history of the Gujba pieces:” A 282g piece came to me as a prospective meteorite of unknown locale from a person in Nigeria with whom I was dealing in other meteorites.  I recognized it as a bencubbinite and sent it to Alan Rubin at UCLA for classification.   While Alan was working on it he received word that another piece from a source in Poland was under investigation.  He was able to find the Islam and Ostaficzuk article which pinpointed the area where it fell.  It seems that there was a Polish oil exploration team in the area at the time of the fall and Ostaficzuk must have been part of that team.  He returned to Poland with some pieces, one of which was sold by a nephew(?) to me and then to you.  Once I read the Islam and Ostaficzuk article and knew the location, I instructed my contacts to collect pieces from the local people.  Quite a large quantity was collected in this way.  Another large quantity was collected by a metal detecting mission somehow related to the late Christian Anger of Austria.”

Specimen Description:
End cut of a complete specimen. Meteorite piece is featured in the cover of Polish meteorite magazine: Meteoryt, nr 4 (72), 2009. Gujba is the only Bencubbinite fall.

References:
Meteoritical Bulletin Database
www.meteoritemarket.com

Additional photo:


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