Science Memes

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submitted 4 months ago by [email protected] to c/[email protected]

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[–] [email protected] 95 points 4 months ago (1 children)

It's the cooling of silica (really, any material) that makes it a glass, and even then, transparency in the visual wavelength is not automatically certain.

[–] [email protected] 75 points 4 months ago (1 children)

Case in point, obsidian.

[–] [email protected] 61 points 4 months ago

Good example. Obsidian is apparently 70% silica. Iron is apparently what makes it black in color. If it's thin enough, it is translucent.

If you cool pure silica slowly enough, with impurities to cause seeding, you will get tons of crystals, not a single glass, that won't be transparent.