this post was submitted on 03 Apr 2024
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Science Memes

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[–] neptune@dmv.social 61 points 7 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.