Talk:Opal Dragon/@comment-5187912-20121001203523

Opals are a combination of Water and Silica.

The chemical compound silicon dioxide, also known as silica or silox (from the Latin "silex"), is the oxide of silicon, chemical formula SiO2, and has been known for its hardness since the 9th century. Silica is most commonly found in nature as sand or quartz. It is a principal component of most types of glass and substances such as concrete.

