#jewelleryfacts365 281/365 Gold fact

Wednesday, May 10, 2017

The visors of astronauts' space helmets receive a coating of gold so thin (0.00005 millimeters, or 0.000002 inches) that it is partially transparent. The astronauts can see through it, but even this thin layer reduces glare and heat from sunlight.

Nature's gems

Elbaite, Lepidolite ~ Cruzeiro mine, Brazil

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