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Transparent Aluminium (theconstructor.org)

submitted 10 months ago by [email protected] to c/[email protected]

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[–] [email protected] 22 points 10 months ago* (last edited 10 months ago) (2 children)

Types of corundum maybe but I think that’s a stretch. Sapphire is (usually) blue Al2O3. Ruby is red Al2O3. Transparent aluminum is Al2O27N5.

[–] [email protected] 10 points 10 months ago (1 children)

Watch faces are often colorless sapphire; I think industrially produced.

[–] [email protected] 15 points 10 months ago (1 children)

Any corundum without trace elements is colorless. Corundum with trace chemical impurities makes the gems we know. Chromium gives the red to rubies, sapphire has iron and titanium, you can get other colors using vanadium or different ratios. Gems are neat.

[–] [email protected] 5 points 10 months ago

Ah so my watch branded the face as "sapphire" because it sounded more sellable than "corundum"?

[–] [email protected] 1 points 10 months ago

That's a fuck ton of oxygen