What Is the Definition of Opal?


Opal is a gemstone consisting of hydrated silica that is typically semi-transparent and that shows varying colours against a pale or dark ground. It is also a mineraloid gel that is deposited at a relatively low temperature.
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Ask.com Answer for: what is the definition of opal
a mineral, an amorphous form of silica, SiO2 with some water of hydration, found in many varieties and colors, including a form that is milky white.
an iridescent variety of this that is used as a gem.
a gem of this.
Source: Dictionary.com
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