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'''Opal''' is a type of silica mineral. It is often valued as a jewel, although it is less valuable the diamond. It was once highly valued by the Romans. During the [[Middle Ages]], it was thought to bring good luck, but now is considered the opposite. It is the birthstone of October.
'''Opal''' is a type of silica mineral. It is often valued as a jewel, although it is less valuable the diamond. It was once highly valued by the Romans. During the [[Middle Ages]], it was thought to bring good luck, but now is considered the opposite. It is the birthstone of October.
[[Category: Birthstones]]
[[Category:Birthstones]]
[[Category: Gems]]
[[Category:Gems]]
==External links==
==External links==
*http://www.britannica.com/topic/opal
*http://www.britannica.com/topic/opal