What is Opal?
[[File:Opal-53714.jpg|thumb|200px|Opal]] The '''opal''' is a [[Rock (geology)|fairly white rock]] [[mineral]]. It is the [[birthstone]] for the month of [[October]]. Opals are made from tiny spheres of [[silica]] (another mineral) and lots of water. ==Related pages== *[[List of minerals]] {{sci-stub}} [[Category:Gemstones]] [[Category:Birthstones]]