Scientifically speaking, the term “crystal” refers to any solid that has an ordered chemical structure. This means that its parts are arranged in a precisely ordered pattern, like bricks in a wall.

Pegmatite is a type of igneous rock characterized by its large crystal sizes, which can range from one centimeter to several ...

Neolithic people sprinkled the crystals over burials. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Hundreds of fragments of a rare transparent ...