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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!01of 10
Purple - Chromium Alum Crystals
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.02of 10
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 Monohydrate Crystals
Wikimedia Commons/Public Domain
This recipe produces lovely blue-green monoclinic crystals.04of 10
Golden Yellow - Rock CandyNorbert 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.05of 10
Orange - Potassium Dichromate CrystalsPotassium 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.06of 10
Clear - Alum Crystals
Ude/Wikimedia Commons/CC BY-SA 3.0
These crystals are clear. Though they do not have bright colors, they can be grown quite large and in a wonderful array of shapes.07of 10
Silver - Silver Crystals
Alchemist-hp/Wikimedia Commons/CC BY-SA 3.0 de
Silver crystals are a common crystal to grow for observation under a microscope, though they can be grown larger, too.08of 10
White - Baking Soda Stalactites
These white baking soda or sodium bicarbonate crystals are intended to simulate stalactite formation in a cave.09of 10
Glowing - Fluorescent Alum CrystalsThese 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.10of 10
Black - Borax CrystalsAnne Helmenstine
You can make crystals that are translucent or solid black by adding black food coloring to ordinary clear borax crystals.