Step 10: Obtainin a "Gold Rain"

Procedure: In a beaker mix 25 ml 0.2 M solution of Pb(NO3)2 and 0.25 ml of KI with 0.4M concentration.  Observe the formation of an abundant amorphous precipitate of lead iodide. Then let it decant and add hot distilled water in a ratio of 1:4 to the yellow suspension  initially obtained, then heat to dissolve the precipitate. If it doesn't completely dissolve, distilled water is added and continue heating. By slow cooling, we observe the formation of small "flaps" of gold that are actually lead iodide. By rapid cooling, is observed a large number of crystallization centers that give the appearance of yellow-pearl.
The reaction is:
Pb(NO3) 2 +2KI → PbI2 + 2KNO3.

<p>I did copper sulphate in chemistry. My teacher gave me all that was made so that I could make a big crystal, but I screwed it up. I was wondering if a clear coating could be applied to protect the crystal from water and probably any people that would want to touch it.</p>
I think that applying an acrylic coating may save your crystal from water and people.
<p>Nice job, thanks for sharing!</p>
<p>Fascinating! But... what is crystal powder and how to obtain? Info has ghly appreciated.</p>
<p>Crystal powder is like ground meat. I mean you can obtain crystal powder by smashing or crushing a big crystal. The crystals are crushed because the crystal powder is more soluble than a big crystal.</p>
Thanks, but I am fond of my crystals. Cannot get myself to destroy one to make another. I'd rather use something else if that's possible.
<p>Yeah, but if you don't like how your crystal looks, you can make it reborn. :D</p>
<p>thanks again, another question: which instrument do you use to smash a big crystal to turn it into powder?</p>
<p>Usually, chemists use something like <a href="https://upload.wikimedia.org/wikipedia/commons/a/af/White-Mortar-and-Pestle.jpg">this</a> to grind crystals, but I think it's fine using any hammer or even a hard stone to smash it. But as @silvicrima said, you need something to keep the powder from spreading.</p>
<p>You can wrap the crystal with a kitchen rag or an old T-shirt you don't mind to ruin. You can smash it with a hammer.</p>
<p>Hello,</p><p>Is this type of crystal powder what you are referring to, please?</p><p><a href="http://www.ebay.com/itm/321301049976?euid=8966244cc3ae42fb90c13c6ec90f04f6&cp=1&exe=13926&ext=35632&sojTags=exe=exe,ext=ext" rel="nofollow">http://www.ebay.com/itm/321301049976?euid=8966244c...</a></p><p>Thank you :)</p>
<p>This may look like crystal powder, but it's just smashed quartz. And you can't grow quartz unfortunately, only nature can.</p><p>The powder should be very soft in order to be solved in water as fast as possible. It should be close to the softness of the flour.</p>
So your saying that iron is made of iron crystals or iron ore and if o smash an iron pipe i can use the powder, in that aspect your stating that i can grow gold!! Sign me up skippy. All joking aside i found your instructable extreemly informative and entertaining. I find that instructables such as yours are the reason I keep coming backso keep up the good work and thank you very much for your efforts and your time .
<p>Good joke, but unfortunately iron crystals don't really exist in nature. But you can find it in composite substances like iron pyrite. That's a beautiful nature-made crystal. It looks like gold. Also, in order to create a crystal, you need a good amount of powder. So even it was possible to grow gold, you would need a lot of gold. :))</p><p>I'm glad that many people appreciate my work and I hope new Instructables will appear with more crystals than mine.</p>
<p>Very neat instructable, I wonder if I can grow crystals that will give me +2 Strength, +3 Dexterity, +2 Intelligence +3 Mana :)<br><br>Anyways, when I was a kid I have found a stone in nearby mountains, inside it is a colorless crystal, like the whole stone, I wonder what it is. I'll try to find one and post it here.<br><br>Also, my friend found an obsidian crystal, I wonder how it is worth.<br></p>
Nice 'ible. If making non-toxic crystals (clear) could a drop of food coloring or pen ink be used to add tint &amp; color to them?
You can color the Alum crystal with food coloring. I have tried it with blue coloring and it works great.<br>The Alum isn't toxic so you can taste it.
<p>Wear gloves so the dye won't stain your hands.</p>
Thinking of handling and spillage, but good to know. Thanks. :)
<p>Is this the same alum that I buy in the grocery store and use when I can some types of pickles?</p>
<p>Go to Amazon. I bought a pound of Alum for about 7.50 dollars.</p>
<p>Go to Amazon. I bought a pound of Alum for about 7.50 dollars.</p>
<p>If on it's label is written KAl(SO4)2. then it's good.</p>
<p>Copper Acetate crystals are fairly easy to grow and are, to my eye, lovely.</p>
<p>Would it be possible to grow amethyst crystals?</p>
Unfortunately no, because they are natural crystals. They are not water soluble. So it's almost impossible to grow one home.
<p>Yes i checked that Amethyst is a type of quartz with certain ''extra'' compunds that give it's natural color. I also found that it's base formula is SiO2, and that it requiers hi preasure to make a synthetic quartz. However I have another question. I noticed that formula for turquoise is ''Cu(Al,Fe3+)6(PO4)4(OH)8*4H2O'' Meaning that it is a crystal hydrate, and it's hardness is 5-6. That said would it be possible to create turquoise crystal at home from a powder using the method described in this instructable? </p><p>Same question about tourmaline, thou it's chemical formula is a bit different.</p><p>http://www.minerals.net/tourmaline_chemical_formula.aspx</p>
<p>you're a nerd</p>
<p>I know. It's actualy preaty cool. For me atleast. </p>
<p>While growing crystals like those in the author's examples is interesting (I used to do this when I was younger and had more free time) these crystals are very fragile. Growing most types of crystals that are durable and of use in jewelry etc. require very specific conditions. For example turquoise started as copper as it oxidized deep in the earth over millennia it was subjected to intense pressure and heat before it became what we call turquoise. The same is true for all of the gemstones or crystals we find attractive and durable enough for jewelry, etc. (My father was a gemologist and goldsmith who owned a jewelry store so I grew up being taught about this from a very young age.)</p><p>Don't let that stop you from discovering some unique and beautiful gems you can grow in your own home though. Store them in covered plastic or glass containers though as I discovered years ago once grown some of these can break down and start to dissolve or decay just from the humidity in the air.</p><p>Props to the original poster - growing crystals is a cool and interesting hobby and you can learn from the process while doing it.</p>
<p>After reading some of the later posts I need to comment to my own post and say; Only use compounds that are safe to handle and store. I did a search and here is a link for &quot;Safe enough&quot; compounds. I'm assuming this means some level of caution is still necessary.</p><p><a href="http://chemistry.about.com/od/growingcrystals/a/Crystal-Chemicals.htm" rel="nofollow">http://chemistry.about.com/od/growingcrystals/a/Cr...</a></p>
<p>I'm not sure if you can grow turquoise home because it's also a natural crystal, so almost all nature-made are impossible for us to be grown home.</p><p>Even if somebody succeed in creating a synthetic crystal, it won't be as beautiful as the original one.</p>
<p>Fascinating! But... what is crystal powder and how to obtain? Info has ghly appreciated.</p>
<p>What an awesome instructable! Thank you so much for all the work you put into this. Your passion for the subject makes it extra interesting. Can't wait to set aside some time to give this a try. </p>
I'm glad you like it. I like crystals, not for their value, but for their age. They are like Earth memories encapsulated in one small and beautiful piece of art.
<p>have you heard a lot of Americans? some slaughter our language, your's is not that bad. thank you again for the instructions. you are right, patience and perseverance are important for anything worth while. as soon as my broken arm heals, i would like to try a couple.</p>
<p>if you can't touch em or eat them, what's the point of making them other then bragging rights? Is there a use for the ones that can't be eaten or touched? </p>
Yes. The initial form of the crystals (which was the crystal powder) is used for a lot of things, but I think it's useless for me to enumerate them here while google is waiting there for you. Anyway, below I put some link for you, maybe you're just lazy. :)<br> <a href="http://www.copper.org/resources/properties/compounds/table_a.html" rel="nofollow">Copper Sulphate Uses</a><br> <a href="https://en.wikipedia.org/wiki/Alum#Uses" rel="nofollow">Alum uses</a><br> <a href="http://https://en.wikipedia.org/wiki/Potassium_dichromate#Uses" rel="nofollow">Potassium Dichromate Uses</a>
What other things can I use to make crystals, like household things besides salt...
<p>you can use borax.</p>
<p>You can use Borax</p><p>https://www.youtube.com/watch?v=BHRFBKjqEvg</p>
<p>Nice info, its great feeling to grow crystals and examine them. awsome chemistry</p>
Thanks. I know it's a great feeling, but you also need a lot of patience. Every nature made thing it's awesome, because even if you can't grow nature made crystals, it's nice that you can make simpler versions of them.
Thanks for the instructable. Can you grow crystals onto fabric?
<p>Thanks for the instructable, I plan to make a variety of crystals for a school project.</p>
<p>First of all I love the instructable I am a huge fan of crystals so I was wondering if I could do something for Halloween which would be that if I could grow crystals on my arm I will use some sort of transparent latex cover for it but I was wondering do you have any suggestions on which crystals I should use? I would like to have the color be either a amethyst color or a calcite sort of color and when it comes to the shape I would like for it to be a Quartz sort of shape. The image below is how I want for it to turn out in the end sort of but only for the arm. Also I want for it to be safe so that people can thouch it but not taste it.</p>
<p>any suggestions for crystal material?</p>
What do you mean by crystal material?
awesome... I hope I can collect the things to do this

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Bio: I enjoy making things by myself, trying to make this world better.
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