An abandoned mine in Spain hides a sparkling treasure – the world's largest geode, a natural crystal phenomenon that has stunned scientists. In abandoned silver mine in Pulpí, in Spain's south ...

The cave contains some of the largest natural crystals ever found ... in Naica contains some of the world's largest deposits of silver, zinc, and lead. In 1910 miners discovered another ...

SILVER bromide has the sodium chloride-type structure, so that a perfect crystal, growing in a uniform environment, would not be expected to show any tendency to unsymmetrical growth. The fact ...

Experts use silver iodide because its structure is very similar to natural ice crystals. When they put silver iodide in the top part of a growing cloud, the silver iodide crystal grows quickly onc ...

Over time, this hydrothermal liquid deposited metals such as gold, silver, lead and zinc ... s National Museum of Natural History. These Smithsonian crystals you can visit, no sweat.

What Is the Spring Equinox? The Spring Equinox (or Vernal Equinox) marks the official first day of Spring, which means more daylight hours (finally) and warmer temperatures. It's a time of great ...