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Agate Nodule from Cathedral Valley, Capitol Reef National Park, Utah
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Photographer: Gerald and Buff Corsi
Collection: CalAcademy
ID: 6666 6666 0613 0068 (2013-06-04)Copyright © 2013 California Academy of Sciences
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INFORMATION PROVIDED WITH THE PHOTO
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date of photo Apr 9, 2011
location
Cathedral Valley, Capitol Reef National Park (Utah, US)notes Agate is a microcrystalline variety of quartz, chiefly chalcedony, cryptocrystalline form of silica; silicon dioxide; characterised by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks but can be common in certain metamorphic rocks. Most agates occur as nodules in volcanic rocks or ancient lavas where they represent cavities originally produced by the disengagement of volatiles in the molten mass which were then filled, wholly or partially, by siliceous matter deposited in regular layers upon the walls.CalAcademy slide # Nodule of Chalcedony 110409 _7007193 photo category: Misc. - geology
original filename: Nodule of Chalcedony 110409 _7007193.jpg
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