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Lot
41194

GUJBA - AN EXCEPTIONALLY RARE CARBONACEOUS CHONDRITE METEORITE. ...

2009 May Signature Natural History Auction #6016

Sold for: Not Sold
Auction Ended On: May 17, 2009
Item Activity: 2 Internet/mail/phone bidders
886 page views
Location:

Heritage Auctions - Design District Annex
1518 Slocum Street
Dallas, TX

Description:
GUJBA - AN EXCEPTIONALLY RARE CARBONACEOUS CHONDRITE METEORITE
CBa Carbonaceous Bencubbinite
Fell April 3, 1984 @ 18:30 local time
Yobe, Nigeria

Bencubbinites are Carbonaceous Chondrites just like the previous listing, but have one important distinction: They did not condense out of the Solar Nebula like other members of this group; instead, an impact on an undifferentiated, carbonaceous chondritic proto-planetary body resulted in a vapor plume with high enough partial pressures to generate metal-enriched gas. Differential condensation, according to boiling point, then occurred in space, resulting in a cloud of liquid metal globules and silicate globules. Density sorting concentrated the metal remainder and depleted the silicate remainder, which then was quench-cooled below the melting point and accreted at cold temperatures, resulting in a metal rich Carbonaceous Chondrite with huge spherical structures resembling chondrules and no evidence of metamorphism at the globule boundaries. Lead isotope dating of Gujba yields and age of 4.563 billion years showing that the cataclysmic collision on the carbonaceous body occurred about 2 million years after the formation of the Solar System. Gujba is widely considered to be one of the most beautiful meteorites in the world with its huge brecciated silicate and metal globules and dark fragment-rich matrix. The Silicates possess reddish oxide and cream, gray, red, black and brown colors which, when contrasted with the bright metal spheroids, create a gorgeous, unique appearance matched by no other meteorite in the world. A superb slice of this very rare and scientifically important meteorite. Measures 38 x 30 mm (1.5 x 1.2 inches) and weighs 20.6 grams.

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