Geology

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And Quartz, of course (imgs.xkcd.com)

submitted 1 year ago by troyunrau@lemmy.ca to c/geology@lemmy.ca

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Source: https://xkcd.com/2501/

Alt text: "How could anyone consider themselves a well-rounded adult without a basic understanding of silicate geochemistry? Silicates are everywhere! It's hard to throw a rock without throwing one!"

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[–] Rubanski@lemm.ee 4 points 1 year ago* (last edited 1 year ago)

Olivine: (Mg,Fe)2SiO4.
Feldspar I: KAlSi3O8.
Feldspar Ii: (K,Na)AlSi3O8.
Quarz: SiO2.
Apparently Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar.

Source : Wikipedia
I can maybe remember Quarz.