metal, iron, & nickel

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A sawn, polished, etched slab of the Canyon Diablo iron (IAB) meteorite showing the Widmanstätten pattern and large, round troilite (iron sulfide) inclusions. The meteorite specimen is the property of the Collection of the Arizona State University Center for Meteorite Studies. Photo by Randy Korotev.

Above: Gujba, a CB chondrite, fell in Nigeria in 1984. Only about 13 CB chondrites are known. Gujba and some other CB chondrites have rounded metal grains. Like Canyon Diablo (above), it has rounded blebs of troilite. Notice that this specimen has not been polished thoroughly so the saw marks are still very evident in the metal.

Below: Usually, however, rounded metal blebs means that the "rock" is a piece of slag. In slags, the metal will be dispersed less evenly than in a meteorite and there are usually vesicles (gas bubbles) in the matrix because the matrix was molten. Click on images for enlargement. Photos by Randy Korotev. Thanks to Karl for loan of the Gujba specimen and Jeff for the slag.

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Prepared by:

Randy L. Korotev

Department of Earth and Planetary Sciences
Washington University in St. Louis

Please don't contact me about the meteorite you think you’ve found until you read this and this.