![]() ![]() Chrome alum naturally produces deep violet crystals. If you're up for a challenge, I'll show you how to grow synthetic quartz yourself next, but first, let's grow a faux amethyst crystal from another type of alum-chrome alum. ![]() The crystal displays the characteristic purple color and octahedral shape.Īmethyst is a purple variety of quartz or silicon dioxide. This is a crystal of chrome alum, also known as chromium alum. Keep in mind, it is not nearly as hard as corundum, so it is fragile. If desired, you can preserve the crystal to use.Place the crystal on a paper towel to dry.In the morning, use a spoon or your hands to remove the crystal. ![]() Place the solution somewhere it won't get bumped or disturbed.Add red food coloring to get a deep red color.This results in a saturated solution that promotes crystal growth. Keep adding alum until no more will dissolve. Dissolve potassium alum in boiling water.Here's how to grow a fake (but pretty) ruby using this chemical: This is the form of alum sometimes sold as natural deodorant crystals. On the other hand, it's quick, easy, and inexpensive to grow faux ruby crystals from potassium alum. It's possible to grow synthetic rubies and sapphires in a lab, but you need a high-temperature furnace and access to pure aluminum oxide (alumina) and chromium oxide. Ruby and sapphire are two forms of the mineral corundum. Food coloring was added to these crystals, which are clear when the alum is pure. This is a crystal of potassium alum or potash alum. ![]()
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