Opal: Revision history

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  • curprev 22:5522:55, April 21, 2008Stryker117 talk contribs 1,314 bytes −271 New page: {{Era|CH}} {{Ratings}} '''Opals''' are amorphous SiO<sub>2</sub>·nH<sub>2</sub>O, hydrated silicon dioxide. The water content is usually between three and ten percent, but can be as high ...