• Mossy Feathers (She/They)@pawb.social
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    6 months ago

    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.

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

      • nxdefiant@startrek.website
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        6 months ago

        “granodiorite” sounds exactly like the kind of name someone who doesn’t want to admit it’s just granite would make up.

        • PlexSheep@infosec.pub
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          6 months ago

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

      • weariedfae@lemmy.world
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        6 months ago

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