Changes

Most metals encountered in everyday life are [http://en.wikipedia.org/wiki/Polycrystal polycrystals]. Crystals are often [[symmetrically]] intergrown to form crystal twins.

Most metals encountered in everyday life are [http://en.wikipedia.org/wiki/Polycrystal polycrystals]. Crystals are often [[symmetrically]] intergrown to form crystal twins.

<center>For lessons on the [[topic]] of '''''Crystals''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Crystals '''''this link'''''].</center>

<center>For lessons on the [[topic]] of '''''Crystals''''', follow [https://nordan.daynal.org/wiki/index.php?title=Category:Crystals '''''this link'''''].</center>

==Crystal structure==

==Crystal structure==

The process of forming a crystalline [[structure]] from a fluid or from materials dissolved in the fluid is often referred to as crystallization. In the ancient example referenced by the root [[meaning]] of the word crystal, water being cooled undergoes a [[phase change]] from liquid to solid beginning with small ice crystals that grow until they [[fuse]], forming a polycrystalline structure. The [[physical]] properties of the ice depend on the size and arrangement of the individual crystals, or grains, and the same may be said of metals solidifying from a molten state.

The process of forming a crystalline [[structure]] from a fluid or from materials dissolved in the fluid is often referred to as crystallization. In the ancient example referenced by the root [[meaning]] of the word crystal, water being cooled undergoes a [[phase change]] from liquid to solid beginning with small ice crystals that grow until they [[fuse]], forming a polycrystalline structure. The [[physical]] properties of the ice depend on the size and arrangement of the individual crystals, or grains, and the same may be said of metals solidifying from a molten state.