Look more closely, though, and it’s easy to tell the difference. What is crystal? Crystal is a type of glass made with lead ...

In crystals, the particles repeat in a pattern that gives the crystal its special shape. Some crystals look very similar but here are a couple of ways to tell them apart. The salt may look a little ...

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 ...

When there are no impurities, pure quartz is water-clear ... dioxide crystals are about eight kilograms in mass and are the size of your head. Synthetic quartz crystals look nothing like their ...