More than 4,000 naturally occurring minerals—inorganic solids that have a characteristic chemical composition and specific crystal structure—have been found on Earth. They are formed of simple ...

Let’s explore the deadliest crystals, minerals, and gemstones that, despite their dazzling appearances, pack a dangerous punch. 1. Arsenopyrite At first glance, arsenopyrite looks like a shiny ...

But there’s a catch with this crystal. While bismuth occurs naturally in the Earth’s crust, the striking crystals that capture the imagination of collectors and artists are usually produced ...

The essential components were a fragile fine wire (the 'cat's whisker') acting as an aerial connected to a small piece of mineral crystal such as galena, which received and converted the signal to ...