Science Memes

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geology problems (mander.xyz)

submitted 5 months ago by [email protected] to c/[email protected]

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[–] [email protected] 35 points 5 months ago* (last edited 5 months ago) (1 children)

Fuck off. You can't just say things like that without telling the class what the difference is.

Edit: it looks like the right one has white specks and the left one doesn't? Can't tell if the white specks are actually there or just image compression or different lighting though.

[–] [email protected] 48 points 5 months ago (3 children)

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: https://www.reddit.com/r/Geologymemes/comments/1cqg1yb/how_identifying_rocks_feels_like_sometimes/

[–] [email protected] 30 points 5 months ago* (last edited 5 months ago) (1 children)

"granodiorite" sounds exactly the kind of name someone who doesn't want to admit it's just granite would make up.

[–] [email protected] 4 points 5 months ago

Minecraft taught me that diorite is also a stone, so maybe it's when the two kinds of stones are mixed together?

[–] [email protected] 1 points 5 months ago

Good ol' grannies (granodiorite). They're important and diagnostic 'round these parts. Migrated down from Canadia we reckon.