  IR mirror.
Gold-surfaced mirror, probably for reflecting infrared light. Not sure why it's so thick, but maybe to dissipate heat and remain flat even while a lot of power is being reflected off it. That's just a guess though.
Source: eBay seller rare-chips-4-u
Contributor: Theodore Gray
Acquired: 17 April, 2009
Text Updated: 17 April, 2009
Price: $20
Size: 2"
Purity: 99%
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