Purchased from Neil Lipson (Lipson@postoffice.att.net) after contact through eBay. No information on the source or use of this sample. This stuff is close to the density of lead, but much harder. It's a nice hunk.
Analysis by x-ray fluorescence spectroscopy at the Center for Microanalysis of Materials, University of Illinois (partially supported by the U.S. Department of Energy under grant DEFG02-91-ER45439) indicates that it is essentially pure molybdenum.
I chose this sample to represent its element in my Photographic Periodic Table Poster. The sample photograph includes text exactly as it appears in the poster, which you are encouraged to buy a copy of.
Source: Neil Lipson
Contributor: Theodore Gray
Acquired: 29 May, 2002
Text Updated: 4 May, 2007