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.