Comment on geology problems

MossyFeathers@pawb.social ⁨4⁩ ⁨months⁩ ago

• fossilesque@mander.xyz ⁨4⁩ ⁨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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  • nxdefiant@startrek.website ⁨4⁩ ⁨months⁩ ago

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

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    • PlexSheep@infosec.pub ⁨3⁩ ⁨months⁩ ago

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

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  • weariedfae@lemmy.world ⁨4⁩ ⁨months⁩ ago

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

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