Opal
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Opal-53714.jpg/200px-Opal-53714.jpg)
The opal is a 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.
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The opal is a 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.