Crystals are solid bodies with a geometrically regular shape. As the earth formed, so were crystals, and they have continued to metamorphose as the planet itself has changed. Crystals are the earth's DNA, a chemical imprint for evolution. They are miniature storehouses, containing the records of the development of the world over millions of years and bearing the indelible memory of the powerful forces that shaped it. Some have been subject to enormous pressure; others grew in chambers deep underground. Some were laid down in layers, while others dripped into being - all of which affects their properties and the way they function. Whatever form they take, their crystalline structure can absorb, conserve, focus, and emit energy, especially on the electromagnetic waveband.