How to make crystal egg geodes (or diamonds in a lid) - Magical Daydream: grow your own crystal egg geode in an eggshell with alum, fun DIY, craft or science project for children. Including a free printable checklist in blogpost
How to grow your own crystal necklace DIY with alum salt. Make crystals at home. This also works as a great science project for children or a cute original gift for a friend. Click through for the full tutorial / DIY including a printable step-by-step checklist.
Grow Purple Chromium Alum Crystals in This Cool Chemistry Experiment: This is a crystal of chrome alum, also known as chromium alum. The crystal displays the characteristic purple color and octohedral shape.