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Bencubbinite CB

The meteorites of this newly designated group are named for their type specimen Bencubbin, which has been found in Australia in 1930. Only five meteorites constitute this group, plus one new member that has recently been found by our team: NWA 1814. There's only one witness fall for this familly: Gujba.

The bencubbinites are strange meteorites that contain more than 50% nickel-iron. If you consider this, they could be easily regarded as true stony-irons, but their mineralogical and chemical properties clearly put them into the clan of the carbonaceous chondrites, or more strictly speaking into the CR clan. Besides the free metal, they contain highly reduced silicates as well as armed chondrules similar to those found in the members of the CR group. Some members of the CB group also contain CAIs; e.g. the meteorite HaH 237 from Libya, which was previously classified as a metal-rich CH chondrite.

This shows the close relationship between the CH and CB chondrites, which are both members of the CR clan. It is probable that all members of this clan formed under different conditions in the same region of the primordial solar nebula, but it's also possible that they are all part of one and the same parent body. That being so, 2 Pallas, the second largest asteroid of our solar system, would be a prominent candidate to be the possible common source of the meteorites of this clan. At least the reflectance spectra of the CR chondrites seem to match the spectra of 2 Pallas quite closely suggesting that those meteorites might have been derived from this large asteroid through impact events. On the other hand the meteorites of the CR clan don't show too many signs of an impact history such as brecciation, shock-veins etc. so that they might have been derived from much smaller parent bodies which aren't to be identified that easily.

The bencubbinites have been divided into two petrologic subgroups, CBa and CBb, representing those with cm-sized metal and silicate chondrules (Bencubbin, Weatherford, Gujba and NWA 1814), and those with mm-sized chondrules (HaH 237 and QUE 94411), respectively

 

GUJBA, CB3a
Fell April 3,1984
11 29' 30" N., 11 39' 30" E.

At 6:30 in the evening, a bright fireball approaching from the west was seen and heard by local residents. The cone-shaped mass that landed in a corn field near the village of Bogga Dingare in Yobe, Nigeria, was estimated to have weighed ~100 kg, but most of the mass was broken up into small pieces and lost.
Gujba is the only fall among the bencubbinite group.

Gujba 00

THE largest slice available Worldwide !!! 17 X 9 cm !!!

216gr

**Price on request  


 

40 X 30 X 20 mm

69 gr

cut on two faces

Price: SOLD

 

39 X 25 X 3 mm

10.58 gr

polished slice

price: SOLD

48 X 46 X 4 mm

39.30 gr gr

has some fusion crust with bubbling, geant chondrules ....
A Museum piece for the advanced collector

Price: SOLD

 

 

38 X 25 X 3 mm

SOLD 9.806 gr

polished slice

price: $950

 

31 X 22 X 6 mm

14.64 gr

a thick slice, interesting for
who want to cut small pieces

price: SOLD

 

38 X 25 X 2 mm

8.972 gr

great polished slice

SOLD    price: $950

 

45 X 42 X 4 mm

40.5 gr gr

Our second best crusted slice

price:  SOLD

 

 

 

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