Source: Wired, 2014
this post was submitted on 21 Dec 2023
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Mildly Interesting
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Would the pink sand from eroding Canadian Shield type rocks be worth looking at? I think there are garnet and quartz around
I always think sand is worth looking at at least once, lol. Get a hand lens (like $10?) and check it out!
Also it's probably pink not because of garnet but because of the oxidized bedrock. I've seen a ton of stuff that looked like that on the shores around the Lake Superior and it was usually some form of basalt, rhyolite, or rare sedimentary interbed. You'd probably see a bunch of smaller reddish pinkish sand grains along with darker gray ones and maybe some milky quartz. But IIRC Canadian Shield stuff is pretty diverse and I recall there being some gnarly meta stuff out there so you might find some glittery mica and garnets.
Ok I took some mediocre photos of the sand with this cheap digital microscope, it looks very nice. Can you tell anything about it?
Awesome photos!
Whoa you were not kidding about that being pink. Holy cow. I mean..the pink grains could potentially be garnet but I'm a little doubtful and unsteady at saying that for sure. They have conchoidal fracture and a vitreous sheen which could easily be quartz, perhaps stained by something else going on in the area (Mn? > Fe).
Those blue green grains are fricken neato, I don't have a good explanation for them and can't really get a good look from the photos.
I see a couple of green grains that could be epidote or some other green mineral, and one that looks a little olivine-esque but it's hard to tell.
It's one of those things that you poke and prod and rotate and stare at for a while before giving a broad, hand wavy guess.
It would probably be helpful to look up the location and the formation to get a better sense of what to expect.
Either way, those are dope!
Do you know what the sand from elafonissi beach (Crete) looks like under a microscope? It really does look pinky when you’re there, and I was told it was because of a certain type of seashell that made up the majority of the top sand. I was a kid though, definitely could have been lies.
Never heard of it but sounds nice! Pink sands can happen for a variety of reasons and I'm not sure exactly what is going on in Crete. I collected some pink sand in the Bahamas that I found interesting and long story short, it was manganese stained fossil coral. It sounds like a similar process is happening in Crete with red stained foraminifera tests (tiny shells). Not sure what the red is in the tests in Crete without digging into it as I only did a cursory search but iron oxide and/or manganese aren't horrible guesses.
Looks like a cool spot!