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{{SeeWikipedia|Opal}} | |||
'''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 as 20%. Opals range from clear through white, gray, red, orange, yellow, green, shore, blue, magenta, rose, pink, slate, olive, brown, and black. Of these hues, the reds against black are the most rare and dear, whereas white and greens are the most common; these are a function of growth size into the red and infrared wavelengths—like precious opal. Common opal is truly amorphous, but precious opal does have a structural element. The word opal comes from the Latin opalus, by Greek opallios, and is from the same root as Sanskrit ''upálá[s]'' for "stone", originally a millstone with ''upárá[s]'' for slab. | '''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 as 20%. Opals range from clear through white, gray, red, orange, yellow, green, shore, blue, magenta, rose, pink, slate, olive, brown, and black. Of these hues, the reds against black are the most rare and dear, whereas white and greens are the most common; these are a function of growth size into the red and infrared wavelengths—like precious opal. Common opal is truly amorphous, but precious opal does have a structural element. The word opal comes from the Latin opalus, by Greek opallios, and is from the same root as Sanskrit ''upálá[s]'' for "stone", originally a millstone with ''upárá[s]'' for slab. | ||
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==Role== | ==Role== | ||
In the [[Covenant Empire|Covenant]] [[The Great Journey|religion]], a black opal represents the [[Age of Doubt]].<ref> | |||
*In the [[Covenant Empire|Covenant]] [[The Great Journey|religion]], a black opal represents the [[Age of Doubt]].<ref>''[[Halo: Contact Harvest]]'', page 307</ref> | |||
==Trivia== | ==Trivia== | ||
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==Sources== | ==Sources== | ||
<references/> | |||
[[Category:Materials]] | [[Category:Materials]] | ||
[[Category:Geology]] | [[Category:Geology]] | ||
