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3D3DRubber penguin from Oliver Sacks.
This little rubber penguin was given to my daughter by Oliver Sacks to keep her entertained during a visit in 2003. Here's a picture of them from his 70th birthday bash:

It's not really an element sample, I just wanted a place to post that picture.
Shockingly, I had this sample cataloged as a duck for years until reader Robert Anderson's eleven year old son pointed out the error. Just goes to show you should never believe anything you read on the internet.
Source: Oliver Sacks
Contributor: Oliver Sacks
Acquired: 8 July, 2003
Text Updated: 21 November, 2007
Price: Donated
Size: 4"
Composition: CHO