I spent 3 months growing this alum crystal

Apr 6, 2026 1:33 PM

crystalchase21

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I like growing crystals out of common household materials such as salt, sugar and fertilizer. And alum crystals are one of the easiest crystals to grow. Alum is a type of salt used in baking, deodorant and water purification.

It's really easy to grow small diamond shaped crystals with alum, but I thought I'd challenge myself to see how big I could get them to grow, and here's the result. I'm pretty happy with it.

If you guys are interested in growing your own crystals, you can find more info in this article that I wrote: https://crystalverse.com/why-you-should-grow-crystals/

@op do you have to put any kind of coating on it to protect the crystal?

3 months ago | Likes 1 Dislikes 0

Alum can also be used to dissolve a steel thread tap that you broke into an aluminum part...

3 months ago | Likes 1 Dislikes 0

3 months ago | Likes 1 Dislikes 0

Grow your own in d8

3 months ago | Likes 1 Dislikes 0

STUNNING display, nice and well done! Will be accessing your link for my science classes!

3 months ago | Likes 1 Dislikes 0

I'd rather grow the Herb Superb.

3 months ago | Likes 1 Dislikes 0

That's a nice d8!

3 months ago | Likes 3 Dislikes 1

Neat!

3 months ago | Likes 1 Dislikes 0

@OP, is it naturally pink, or did you have to dye it?

3 months ago | Likes 15 Dislikes 1

A bit of chrome alum was added. Chrome alum is dark purple. Mixed with regular alum, it becomes pink.

3 months ago | Likes 28 Dislikes 0

That's lovely! How long do they stay nice looking given they’re water soluble? | live in the southern US and worry I'll put in time to grow something awesome only to have it get dull and cloudy with all the totally wonderful and not at all gross humidity here.

3 months ago | Likes 1 Dislikes 0

Hey I’ve seen some of your videos. Nice!

3 months ago | Likes 1 Dislikes 0

3 months ago | Likes 4 Dislikes 2

How hard is it @OP? Could it be cut and polished? Like Mohs hardness of at least 5 or maybe 6?

3 months ago | Likes 2 Dislikes 0

Unfortunately not. It's brittle and water soluble. Mohs hardness 2-3.

3 months ago | Likes 5 Dislikes 0

Bummer. Still cool AF though! I've always thought growing your own crystals looked like a fun hobby. I struggle in the patience department though. :) Nice work!

3 months ago | Likes 2 Dislikes 0

This is beautiful. Could you leave something like this out on a desk as a decoration or would the air eventually cloud it or change its composition?

3 months ago | Likes 1 Dislikes 0

Does it look nice and regular like that naturally or did you cut it? Really cool either way.

3 months ago | Likes 1 Dislikes 0

If careful with the conditions they grow that way. That shape reflects the internal arrangement of the atomic crystal structure which keeps repeating as the crystal grows. The atoms do all the work.

3 months ago | Likes 1 Dislikes 0

Try chrome alum next. Lovely purple

3 months ago | Likes 2 Dislikes 1

Slower, you slut. ;)

3 months ago | Likes 1 Dislikes 0

Passing that bladder stone must have been a bitch!

3 months ago | Likes 88 Dislikes 1

3 months ago | Likes 1 Dislikes 0

Naaa, now that I have a 300hp wet/dry industrial shop vac, those kidneys stones are no longer a problem.

3 months ago | Likes 1 Dislikes 0

Uh…

3 months ago | Likes 10 Dislikes 0

I named this one shredder. You know, in memory of my urethra.

3 months ago | Likes 2 Dislikes 0

I'm still traumatized by my latest kidney stone. It was... traumatic.

3 months ago | Likes 2 Dislikes 0

That's how it got it's pink color.

3 months ago | Likes 11 Dislikes 0

I love these Crystal people. "I spent x months growing this" as if it was inside their womb or something :D

3 months ago | Likes 4 Dislikes 4

3 months ago | Likes 6 Dislikes 0

Wow. This is fascinating. I think I see "imperfections". Is there a way to avoid this? I mean, its not bad and kind of feels like a personality for the cristals. How ever it would be nice to grow one without those, or even to try to grow them in a specific pattern.

3 months ago | Likes 1 Dislikes 0

Want to make this staff real someday. Just need to grow or find a smoked quarts or similar looking crystal.

3 months ago | Likes 5 Dislikes 1

3 months ago | Likes 6 Dislikes 2

3 months ago | Likes 6 Dislikes 2

Isn't alum salt used as a scent/smell neutralizer?

3 months ago | Likes 1 Dislikes 0

I've seen it used (and used it myself) as a deodorant, so probably. It also helps shave cuts to stop bleeding.

3 months ago | Likes 1 Dislikes 0

Neat.

3 months ago | Likes 2 Dislikes 0

I tried to use a kit I found (back in the 90's) to make crystals once and just ended up with weird coral-like crystals that just disappointed me. The box advertised crystals that looked more like what your article shows but all I could make was sadness.

3 months ago | Likes 35 Dislikes 1

Yeah those kits aren't always reliable. Sometimes the temperature isn't correct, or the volume of the solution isn't enough. When this happens, instead of crystals forming under the solution, you have corals forming on top of the solution.

3 months ago | Likes 23 Dislikes 1

Well when my kid is old enough maybe I can show him how to properly make nice crystals one day ( he's 2)

3 months ago | Likes 11 Dislikes 2

3 months ago | Likes 36 Dislikes 0

Realized the other day that Evangelion’s thesis is “if God showed up and tried to say hi we’d just keep building bigger guns until we could kill him”

3 months ago | Likes 6 Dislikes 0

I thought NGE is about how god/the angels from space are trying to wipe out humanity?

3 months ago | Likes 3 Dislikes 0

That is a surface level truth. Once you get a few episodes in, they start showing you some of the deeper truths beneath that.

3 months ago | Likes 2 Dislikes 1

3 months ago | Likes 2 Dislikes 0

I don’t recall exactly but I feel like the spirit of the story is that it wouldn’t matter what their motives were; we’ll fuck it all up ourselves regardless

3 months ago | Likes 2 Dislikes 0

We wanna go out on our own terms.

3 months ago | Likes 3 Dislikes 0

What does it taste like?

3 months ago | Likes 8 Dislikes 0

Extremely bitter. It's used for cooking and water purification

3 months ago | Likes 1 Dislikes 0

I did once grow alum crystals (I gave up quick and didn't grow them beyond a few mm) and since at least the kind of alum I had is not toxic, I tasted it.

3 months ago | Likes 10 Dislikes 0

Oops pressed enter, it tastes kinda like the cartoon "sucking on a lemon" effect.

3 months ago | Likes 15 Dislikes 0

Yes... I want to know as well.

3 months ago | Likes 5 Dislikes 0

He said Alum is a type of salt so I'd guess: "salty".

3 months ago | Likes 2 Dislikes 0