10 Colored Crystal Recipes

Grown Naturally

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!

Purple chrome alum or chromium alum crystal

Ra'ike/Wikimedia Commons/CC BY-SA 3.0

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.

Blue copper sulfate crystals

 Crystal Titan/Wikimedia Commons/CC BY-SA 4.0

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.

Blue-green copper acetate crystals

Wikimedia Commons/Public Domain

This recipe produces lovely blue-green monoclinic crystals.
Yellow rock candy
Norbert Eisele-Hein / Getty Images

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.

Orange potassium dichromate crystals
Potassium dichromate is also known as the mineral lopezite.

 A13ean/Wikimedia Commons/CC BY-SA 3.0

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

Clear potassium alum crystals

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

Silver crystals

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

Baking soda crystals in the shape of a star


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

Glow-in-the-dark alum crystals
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.

Borax crystals, dyed black
Anne Helmenstine

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