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Author: Subject: Chemicals for crystal growing
Velzee
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[*] posted on 8-2-2016 at 09:51


Quote: Originally posted by crystal grower  
This one is NaHSO4.10H2O crystal made by cooling the solution.
I u want simply and quickly made crystals I could only recommend this one. Only but quite serious con is that this stuff is very hygroscopic and can be easily dehydratated.


:o All I keep getting from you is amazingness!! Keep it coming! Perhaps, try colored crystals(red, green, yellow, ect.)?




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[*] posted on 8-2-2016 at 10:06


I once bought some nylon fishing wire to dangle crystals from, and I could not tie knots in the damned stuff. It would just flip back to its original shape. And when I could get a knot it in, getting the xtal to stay in it was usually a losing battle. Thin copper wire worked better, but only for some particularly unreactive substances.



Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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[*] posted on 8-2-2016 at 10:14


Quote: Originally posted by Velzee  
Quote: Originally posted by crystal grower  
This one is NaHSO4.10H2O crystal made by cooling the solution.
I u want simply and quickly made crystals I could only recommend this one. Only but quite serious con is that this stuff is very hygroscopic and can be easily dehydratated.


:o All I keep getting from you is amazingness!! Keep it coming! Perhaps, try colored crystals(red, green, yellow, ect.)?

Thanks very much:).
"Colored crystals"-you mean by food colorant?
Yes that would be interesting to look at ,altough useless for my collection (I prefer natural colors). But I could try it with this compound or maybe with magnesium sulfate.
Anyway thanks for advice.




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crystal grower
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[*] posted on 8-2-2016 at 10:21


Quote: Originally posted by DraconicAcid  
I once bought some nylon fishing wire to dangle crystals from, and I could not tie knots in the damned stuff. It would just flip back to its original shape. And when I could get a knot it in, getting the xtal to stay in it was usually a losing battle. Thin copper wire worked better, but only for some particularly unreactipve substances.

I know this problem very well. :DSometimes I get rage like this:mad: -especially when u finally make a knot and the crystal break down.
Maybe try the procedure I described on the previous page.


[Edited on 8-2-2016 by crystal grower]




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Velzee
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[*] posted on 8-2-2016 at 10:37


@crystal grower I meant naturally colored, for example, K2Cr2O7.



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[*] posted on 8-2-2016 at 10:47


I already have p.dichromate crystals grown.
I will try mixing it with some transparent compound but I haven't p.dichromate at the moment.
When they will be done I will certainly post them here.




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[*] posted on 8-2-2016 at 14:35


Quote: Originally posted by DraconicAcid  
I once bought some nylon fishing wire to dangle crystals from, and I could not tie knots in the damned stuff. It would just flip back to its original shape.


After numerous failed attempts, I have found a solution for this problem, so simple that it is stupid. Use a sole, double-overhand knot (I mean, insert seed on step 5 of that animation). It has slight self-tightening property, just enough to hold nylon line. Also, it is not making a big lump of thread inside crystal.

Though, fishing like is too thick for small seeds, better use a filament from some rope or something like this.

[Edited on 8-2-2016 by Dmishin]
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[*] posted on 11-2-2016 at 05:44


Nothing special, but pretty anyway. MgSO4.7H2O monocrystal.



mgso4.JPG - 1.5MBmgso44.JPG - 1.4MB




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[*] posted on 11-2-2016 at 07:56


Quote: Originally posted by crystal grower  
Nothing special, but pretty anyway. MgSO4.7H2O monocrystal.



Wow! That's quite a whopper.

Many would be interested knowing how it was made or obtained. I wouldn't usually consider MgSO4.7H2O as an ideal crystal growing material.




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[*] posted on 11-2-2016 at 08:36


FOr one, that Sodium Bisulfate crystal is stunning.
But I noticed this on twitter a while ago, this run of the competition is over, but I found it interesting:
http://www.uscrystalgrowingcompetition.org/
Maybe it seems a 'kiddie' sort of thing, but I wouldn't mind submitting something, that's for sure! Has anyone heard of this before?




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[*] posted on 11-2-2016 at 11:08


Quote: Originally posted by blogfast25  
Quote: Originally posted by crystal grower  
Nothing special, but pretty anyway. MgSO4.7H2O monocrystal.



Wow! That's quite a whopper.

Many would be interested knowing how it was made or obtai
ned. I wouldn't usually consider MgSO4.7H2O as an ideal crystal growing material.

Epson salt ussually forms long needles and it's difficult to grow large single crystal (it also form many parasitic crystals quite often ) .
That was serious problem for me.
For this crystal I used this procedure:
I made some crystals by slow cooling of the solution.
I picked the pretiest of them and tied it on a thread.
Then I put it back to the solution.
I noticed that the solution is slightly yellow I probably accidentally contamined it with iron(III) chloride (I had worked with it before that). Yeah that seems to be amateur mistake, but it appeared that the iron chloride (which didnt form crystals itself somehow helped the MgSO4 to grow single crystal without any parasites.
Then I let the solution to slowly evaporate.
I don't exactly know how it work :D but I have heard that FeCl3 is sometimes used for similiar purposes.




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smile.gif posted on 19-2-2016 at 06:45
Great stuff being posted here!


Quote: Originally posted by nezza  
This is a small crystal of praseodymium sulphate (About 7-8mm long). It appeared slowly (several months) in a solution of the sulphate I made some time ago.
files.php.jpg - 149kB

Congratulations, Nezza. It's a beauty. Crystallising the rare earth sulphates is not that easy. A bit of luck is needed as well, I guess, as I run into supersaturation most of the times. I have a similar size crystal from Nd2(SO4)3.8H2O. I get the impression that it is an advantage if the solutions are not too pure. My Nd-sulphate crystals formed with ease from the Nd-sulphate extracted from magnets, that surely contained some minor impurities from the magnets.
IMG_3314_zoom_cleaned.jpg - 11kB IMG_3150_close_up_cleaned.jpg - 9kB

Here's a small samarium acetate crystal. I've seen picture from a German guy who crew crystals a few inches in size from this substance.
IMG_5532_den_adj_detail.jpg - 6kB

Quote: Originally posted by The Volatile Chemist  
Quote: Originally posted by crystal grower  
Have anyone experience with growing crystals in gel?
I'd be very thankful for any information.

I've done this, one must add an organic acid (weak acetic) to a solution containing one reactant and Silica gel. When this hardens, add the second reactant on top and allow to sit until crystallization occurs. One of the products must be less water-soluble than the reactants to crystallize. Done this w/ copper, lead, Copper(II) hydrogen phthalate, and PbI.
(...)

VolatileChemist, I'd love to see your PbI2 crystals produced this way. Have you somewhere written down the method you used?
I could only produce the yellow-golden platelets from letting a hot solution of PbI2 cool down.
IMG_7277_adj2of3_-3535.jpg - 13kB

Quote: Originally posted by Dmishin  
Oh, crystals! I am sorry in advance for picture-loaded post. So, here is a part of my humble collection.
(...)
K2SO4
files.php.jpg - 599kB
(...)
All of them grown using evaporation method, without any special equipment.

That's peculiar as you get a lovely hexagonal bipyramid. Wish I had obtained a seed crystal like that! Did this just form in your solution? I only got tabular crystals from K2SO4.
IMG_9294_cleaned.jpg - 16kB


Quote: Originally posted by DraconicAcid  
Quote: Originally posted by Dmishin  
Quote: Originally posted by DraconicAcid  

A similar method worked ... not (NH4)2Cu(SO4)2*6H2O


I wonder why. I tried this in mini-test (few ml of solution), and observed light-blue tabular crystals, clearly different from the pure CuSO4*5H2O.

I got more clusters of crystals than observable single crystals. I'll try again.

Monocrystals should form cubes with some of the corners cut off diagonally, according to H.L Heys' Chemistry Experiments at Home for Boys and Girls (ISBN 9780245554476) . This take very slow evaporation and controlled temperature changes. Mine were crystallised too quickly and gave such results as these.
IMG_4009_adj.jpg - 42kB
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[*] posted on 20-2-2016 at 08:21
Barium chloride


IMG_7520.JPG - 362kB IMG_7570_detail.JPG - 160kB IMG_7692.JPG - 400kB
Barium chloride dihydrate crystallises as large plates with the corners cut off at about 45°. The crystals grow very easily by cooling down the solution. (Always make sure some undissolved crystals are at the bottom before hanging in your seed crystal - since they grow quickly, they also dissolve quickly...) In the pictures above, the crystal is suspended from a 0.1 mm nylon monofilament thread. There doesn't seem to be a problem in hanging some 100 grams on these threads.

Care must be taken not to let them grow too fast, or all kinds of outgrowths will detract from their beauty.
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[*] posted on 20-2-2016 at 09:55


@bezaleel very nice indeed.
I've never grown Barium chloride crystals but I'm going to try it.
Thanks for all the info.
Barium chloride is quite harmful stuff so be careful (You probably know it very well but I want to warn everyone unacquainted).




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[*] posted on 21-2-2016 at 07:12


Small crystals of nickel sulfate hexahydrate.
I will hopefully post bigger crystals when they will be done.

NiSo4.6H2o.JPG - 1.4MB




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[*] posted on 21-2-2016 at 08:18


Quote: Originally posted by crystal grower  
Small crystals of nickel sulfate hexahydrate.
I will hopefully post bigger crystals when they will be done.


Very nice crystals! I made 200g of nickel sulfate the other they and they crystallised into the beautiful crystals you have there. But upon placing on some paper towels to dry, the next day they had dehydrated into a gray-green crumbly powder. I don't know if you will have the same problem but the humidity here is 60% so if you want your crystals to last you need to be somewhere more humid than 60% (I don't know by how much you have to be above by) or use nail varnish as soon as you remove the crystal from the water.
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[*] posted on 21-2-2016 at 09:04


Quote: Originally posted by Deathunter88  
Quote: Originally posted by crystal grower  
Small crystals of nickel sulfate hexahydrate.
I will hopefully post bigger crystals when they will be done.


Very nice crystals! I made 200g of nickel sulfate the other they and they crystallised into the beautiful crystals you have there. But upon placing on some paper towels to dry, the next day they had dehydrated into a gray-green crumbly powder. I don't know if you will have the same problem but the humidity here is 60% so if you want your crystals to last you need to be somewhere more humid than 60% (I don't know by how much you have to be above by) or use nail varnish as soon as you remove the crystal from the water.

Thanks for caution.
They were being on air about 6 hours till now and it seems that they arent dehydrating at all.
Now I am going to grow bigger crystal and I will probably set it in closed akryl box. I hope it will be enough.




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[*] posted on 21-2-2016 at 10:10


Does anyone here grow crystal gardens? I'm trying to figure out what is in Mrs. Stewart's brand bluing. The MSDS reveals nothing, and the company website says it is basically a "blue iron" in a buffer solution. I suspect it is potassium ferrous ferricyanide and a phosphate buffer.
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[*] posted on 21-2-2016 at 11:41


Well, that took about 40 years...
About 40 years ago my grandmother told me about this, but her recollection of it was poor. It was something she had heard of, rather than actually done.
The only bits of the recipe she was sure of were the ammonia and the washing blue.
so, It's very likely that the blue referred to on that web page was the same blue that was sold for blueing clothes.
If that's the case it was prussian blue.
And maybe I will try it- 40 years later...
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[*] posted on 22-2-2016 at 16:28


Crystal grower, I don't have a picture of the PbI2 crystals grown in Silica gel, but if one combines silicic acid and a small amount of acetic acid (vinegar concentration will do) and lead nitrate, then lets it harden overnight, then adds a solution of KI on top of the gel after, and lets it sit, crystals form in the gel. Unfortunately, they did seem a bit too thin to grab out of the gel.



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[*] posted on 23-2-2016 at 03:42


Quote: Originally posted by The Volatile Chemist  
Crystal grower, I don't have a picture of the PbI2 crystals grown in Silica gel, but if one combines silicic acid and a small amount of acetic acid (vinegar concentration will do) and lead nitrate, then lets it harden overnight, then adds a solution of KI on top of the gel after, and lets it sit, crystals form in the gel. Unfortunately, they did seem a bit too thin to grab out of the gel.

In fact that was Bezaleel who asked you this question but anyway thanks for answer.




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[*] posted on 23-2-2016 at 03:48


Another crystals of NiSO4 but this time they are more green than blue. Am I right that it´s heptahydrate ??

niso4.1.JPG - 1.4MB

[Edited on 23-2-2016 by crystal grower]




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[*] posted on 26-2-2016 at 07:49


Crystal grower, you are correct. The blue one is the hexahydrate, the green one is the heptahydate.

Quote: Originally posted by crystal grower  
@bezaleel very nice indeed.
I've never grown Barium chloride crystals but I'm going to try it.
Thanks for all the info.
Barium chloride is quite harmful stuff so be careful (You probably know it very well but I want to warn everyone unacquainted).

Thanks!
I wonder why you remark the harmfulness of barium salts, whereas you don't mention that both nickel salts and dichromates are carcinogens...

Quote: Originally posted by crystal grower  
Quote: Originally posted by The Volatile Chemist  
Crystal grower, I don't have a picture of the PbI2 crystals grown in Silica gel, but if one combines silicic acid and a small amount of acetic acid (vinegar concentration will do) and lead nitrate, then lets it harden overnight, then adds a solution of KI on top of the gel after, and lets it sit, crystals form in the gel. Unfortunately, they did seem a bit too thin to grab out of the gel.

In fact that was Bezaleel who asked you this question but anyway thanks for answer.

Indeed - thanks.
@Volatile Chemist: I keep wondering about your procedure for crystal growing in silicic acid gel. You say that you combine silicic acid with dilute acetic acid, but silicic acid is a hard substance. Thus it seems like you combined sodium silicate solution (waterglass) with acetic acid and lead acetate solution. But if that is so, then why is there no lead silicate being formed? Or is there, and is metathesis with KI what happens next?
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[*] posted on 26-2-2016 at 10:34


Quote: Originally posted by Bezaleel  
Crystal grower, you are correct. The blue one is the hexahydrate, the green one is the heptahydate.

Quote: Originally posted by crystal grower  
@bezaleel very nice indeed.
I've never grown Barium chloride crystals but I'm going to try it.
Thanks for all the info.
Barium chloride is quite harmful stuff so be careful (You probably know it very well but I want to warn everyone unacquainted).

Thanks!
I wonder why you remark the harmfulness of barium salts, whereas you don't mention that both nickel salts and dichromates are carcinogens...


That is because based on acute toxicity, barium chloride is much more dangerous than nickel sulphate or potassium dichromate. The amount of barium chloride needed to kill a grown man weighing 80kg is about 0.8-0.9 grams, while the amount of potassium dichromate needed to kill a grown man of the same weight would be about 15.2 grams. (These are not values based off of animal LD50s, they are actual data gathered on unfortunate accidental human poisonings.)
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[*] posted on 26-2-2016 at 10:53


Quote: Originally posted by Deathunter88  


That is because based on acute toxicity, barium chloride is much more dangerous than nickel sulphate or potassium dichromate. The amount of barium chloride needed to kill a grown man weighing 80kg is about 0.8-0.9 grams, while the amount of potassium dichromate needed to kill a grown man of the same weight would be about 15.2 grams. (These are not values based off of animal LD50s, they are actual data gathered on unfortunate accidental human poisonings.)


Yep, but Bezaleel is also right that I should mention the toxicity of Cr6+
And nickel salts.

[Edited on 26-2-2016 by crystal grower]




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