ElectricMetal 
I helped an old scientist clean out some electronics equipment that was gathering dust in his closets.
I'm new to this, and I know very little about RAM chips, but I think these things are beautiful.
Purple ceramic, gold pins, silver colored heat sink
I did some research on the manufacturer: SEMi
SEMi was a subsidiary of the company Electronic Memories & Magnetics Corp. -- an integrated circuit maker with government/military contracts in the 70s and early 80s. In 1985 SEMi was bought by another military contractor named Titan Systems -- now a part of L-3 Communications.
Based on that history, I would guess that these chips must be at least 25-30 years old.
Here is a link to some photos:
http://www.flickr.com/photos/48865091@N04/
If anyone knows anything more about the company SEMi or these chips in particular -- history/value/applications etc. -- I'd love to learn more. As mentioned above, I'm very new to this so even very basic facts and figures would be appreciated.
Bookmarks