Ceramics-Glass

__Ceramics__

 * ===Glass===
 * Amorphous solid in many forms for thousands of years.Glass is produced naturaly when rocks and silicates melt at high tempatures and cool before the can crystalize. Man made glass is a mixture of silica, soda, and lime.
 * Glass is a hard material normally fragile and transparent.
 * First maunfactured by humans in 12,000 BC
 * Bottles, Windows, Fiber glass

__References__

 * 1) S.E., Smith . "What is Glass." //Wise Geek//. 30 Apr 2009 .