When we talk about crystals around here, we’re generally talking about the quartz variety used to make oscillators more stable, or perhaps ruby crystals used to make a laser. We hardly ever talk about homegrown crystals, though, and that’s a shame once you see how easy it is to make beautiful crystals from scratch. We’ve…
Growing Spectacular Gem-Like Crystals from Rust and Simple Ingredients — Hackaday
All About Writing and more 