Colored Crystal Recipes Collection

Instructions for Growing Naturally Colored Crystals

This is a list of colored crystal projects. These crystal colors are natural, not caused by food coloring or another additive. You can grow natural crystals in pretty much any color of the rainbow!

01
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This is a crystal of chrome alum, also known as chromium alum.
This is a crystal of chrome alum, also known as chromium alum. The crystal displays the characteristic purple color and octohedral shape. Ra'ike, Wikipedia Commons

These crystals are deep violet if you use pure chromium alum. If you mix the chromium alum with regular alum you can get lavender crystals. This is a stunning type of crystal that is easy to grow.

02
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Copper Sulfate Crystals
Copper Sulfate Crystals. Stephanb, wikipedia.org
Many people find this to be the most beautifully colored crystal you can grow yourself. This crystal is also easy to grow. You can order this chemical or you may be able to find it sold as an algicide for use in pools, fountains, or aquaria.

03
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This recipe produces lovely blue-green monoclinic crystals.

04
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If you crystallize raw sugar or brown sugar you will get rock candy that is golden or brown.
If you crystallize raw sugar or brown sugar you will get rock candy that is naturally golden or brown. It has a more complex flavor than that of rock candy made from white sugar. Lyzzy, Wikipedia Commons

Sugar crystals grown using white sugar are clear, though they can be made any color using food coloring. If you use raw sugar or brown sugar, your rock candy will be naturally gold or brown.

05
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Potassium dichromate has a bright orange-red color.
Potassium dichromate has a bright orange-red color. It is a hexavalent chromium compound, so avoid contact or ingestion. Use an appropriate disposal method. Ben Mills

Potassium dichromate crystals will be bright orange rectangular prisms. It's an unusual color for crystals, so be sure to give it a try.

06
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Potassium ferricyanide is also called Red Prussiate of Potash.
Potassium ferricyanide is also called Red Prussiate of Potash. It forms red monoclinic crystals. Ben Mills

Don't be scared off by the 'cyanide' part of the name. The chemical is not particularly hazardous. This recipe produces beautiful red monoclinic crystals.

07
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Alum crystals are probably the easiest crystals to grow.
Alum crystals are probably the easiest crystals to grow. The chemical is non-toxic and the crystals grow quickly and reliably. Anne Helmenstine

These crystals are clear. Though they do not have bright colors, they can be grown quite large and in a wonderful array of shapes.

08
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Silver Crystals
Photograph of crystals of silver metal, with a penny included to indicate the size of the sample. U.S. Geological Survey

Silver crystals are a common crystal to grow for observation under a microscope though they can be grown larger, too.

09
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It's easy to simulate the growth of stalactites and stalagmites using household ingredients.
It's easy to simulate the growth of stalactites and stalagmites using household ingredients. Anne Helmenstine

These white baking soda or sodium bicarbonate crystals are intended to simulate stalactite formation in a cave.

10
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These easy-to-grow alum crystals glow in the dark.
These easy-to-grow alum crystals glow, thanks to the addition of a little fluorescent dye to the crystal growing solution. Anne Helmenstine

Making crystals that glow when exposed to black light is as easy as making non-glowing crystals. The color of the glow you get depends on the dye that you add to the crystal solution.

11
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You can grow borax crystals in any color, including black.
You can grow borax crystals in any color -- even black! These crystals were growing using black food coloring. Anne Helmenstine

You can make crystals that are translucent or solid black by adding black food coloring to ordinary clear borax crystals.