  Antique sponge.
This sample came from the lab of a deceased chemist. Look at the date on it! Rec'd 10-5-27: It's over 80 years old. Fortunately precious metals don't go bad. Sponge, by the way, refers to very finely powdered material with high surface area. It looks like little balls, but if you touched it it would probably be very powdery. Palladium is used as a catalyst where surface area is important, that's probably why it was made into sponge form.
Source: Ethan Currens
Contributor: Theodore Gray
Acquired: 19 November, 2008
Price: Anonymous
Size: 2"
Purity: >99%
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