Germanium Slabs
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I'm not sure what these were made for, but they are rather nice, a bit like single crystal silicon boule slices except made of germanium instead. I got them from a guy I bought a batch of germanium lenses from (see above): He thought I would appreciate them, and I do!
Source: eBay seller 142pimp
Contributor: eBay seller 142pimp
Acquired: 16 November, 2003
Price: Donated
Size: 3"
Purity: 99.9%