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3D3DSilicon mirror.
This is a mirror designed to reflect something other than visible light: Perhaps someone will enlighten me. It's obviously very flat and shiny, but not too good as a visible light mirror because silicon absorbs a lot of the visible light striking it.
Source: eBay seller flabster
Contributor: Theodore Gray
Acquired: 20 June, 2004
Price: $10
Size: 1.5"
Purity: 99.9999%