Comment on geology problems

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fossilesque@mander.xyz ⁨5⁩ ⁨months⁩ ago

You are right, my bad. :) One is granite and the other one is granodiorite.

Granite is a rock with certain minerals in certain ratios: quartz, alkali feldspar(AF) and plagioclase(PL), where there is more AF than PL.(+accessory minerals of course but let’s keep it simple). Granodiorite has more PL than AF. For more information, look up the Streckeisen diagram, it’s a little scary at first but there are good explanations of it. :)

Sauce: reddit.com/…/how_identifying_rocks_feels_like_som…

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