Gujba, Rare Nigerian Bencubbinite Fall, Micromount

$10.00
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On April 03, 1984, a bright fireball exploded in the sky over rural Nigeria near the town of Bogga Dingare. Local residents broke up the meteorite into many pieces and distributed them amongst themselves. Some specimens were taken to a lab for analysis and were classified as a rare Bencubbin type. The official classification is "CBa" which is carbonaceous chondrite, Bencubbin-like. This meteorite has a distinctive and strange matrix made of silicate clasts and large metal nodules set into a mixed fine-grained groundmass. For type collectors, this meteorite is of double-interest as a rare type and a witnessed fall.

The specimens being offered here are small solid fragments that may contain metal or a mix of silicate and metal. I only have four of these fragments available.

Refer to the photo. The black centimeter cube is shown for scale and is not included. You are purchasing a single small fragment like the one shown. Your purchase will include a labeled gemjar for safe storage.

From the Meteoritical Bulletin entry on Gujba :

Gujba

Yobe, Nigeria

Fell 1984 April 3, 18:30 local time

Bencubbin-like meteorite

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 secondhand reports indicate that it had a volume of ~20 000 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 nodules are metal. Description and classification (A. Rubin and G. Kallemeyn, UCLA, based on a 282 g 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 is similar to that of Bencubbin; shock stage, S2; weathering grade, W0. Oxygen isotopes (R. Clayton, UChi): light-colored silicates, δ17O = -2.19·, δ18O = +0.53·; dark-colored silicates, δ17O = -1.78·, δ18O = +0.98·. Specimens: 12.2 kg, mostly disintegrated, UMaid; 815 g, MZP; type specimen, 64 g, UCLA; remainder of 282 g mass, Twelker.