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Mitchell Co., North Carolina, USA
© Rob Lavinsky
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| A variety of Opal This material should be properly labelled as Opal-AN An often-colourless variety of Opal found as globular concretions. It is an amorphous silica-glass containing water. It is often refered to by the common name 'Hyalite'. This form of opal occurs in volcanic and pegmatite environments where the silica deposits at elevated temperatures. The "A" in the name stands for amorphous; the subscript "N" is to imply its structure is network-like similar to silica glass rather than composed of separate gel spheres; however, it still contains significant water. | ||||||||||||
Classification of Opal-AN | ||||||||||
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Occurrences of Opal-AN | ||||||||||
| Geological Setting: | Volcanic vugs, pegmatite vugs. | |||||||||
Chemical Properties of Opal-AN | ||||||||||
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| All elements listed in formula: | H, O, Si | |||||||||
Other Names for Opal-AN | ||||||||||
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Other Information | ||||||||||
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. | |||||||||
Internet Links for Opal-AN | ||||||||||
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Localities for Opal-AN | ||||||||||
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