Northwest Africa 176, Ungrouped

Northwest Africa 176 is an unusual ungrouped iron meteorite that appears to be more closely related to carbonaceous chondrites than to most iron meteorite groups.  Its only close relative is Bocaiuva.  David Weir has posted a pretty concise summary of the current state of research on NWA 176 on his website, here.  Liu et al.’s LPSC abstract (2001) is also a good source of information.

Here’s the Bulletin write-up:
…And here are some photos of a 98.7 gram complete slice.

Note the size of the silicate blebs exposed on the front face of the slice (up to ~2 cm), and the thickness of the slice (~4 mm).  Yet the silicates don’t penetrate the slice: they must be asymmetrical.