Biography
Opal The
mineraloid opal is
amorphous SiO2·nH2O; hydrated silicon dioxide, the water content sometimes being as high as 20%. Opal ranges from colorless through white, milky blue, gray, red, yellow, green, brown and black. Common opal is truly amorphous, but precious opal does have a structural element. The word opal comes from the
Sanskrit upala, the
Greek opallios, and the
Latin...
Top 5 Guitar Tabs
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