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Opal-AN
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Valeč (Waltsch), Doupov (Duppau), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
© G. van der Veldt
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A variety of Opal
An often-colourless variety of Opal found as globular concretions. It is an amorphous silica-glass containing water. It is often referred 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.
An often-colourless variety of Opal found as globular concretions. It is an amorphous silica-glass containing water. It is often referred 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 | ||||||||||
| mindat.org URL: | http://www.mindat.org/min-1959.html Please feel free to link to this page. | |||||||||
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Occurrences of Opal-AN | ||||||||||
| Geological Setting: | Volcanic vugs, pegmatite pockets. | |||||||||
Chemical Properties of Opal-AN | ||||||||||
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| Essential elements: | H, O, Si | |||||||||
| 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. | |||||||||
References for Opal-AN | ||||||||||
| Reference List: - + | Graetsch, H. (1994) Structural characteristics of opaline and microcrystalline silica minerals. In: Reviews in Mineralogy, Volume 29, Silica - Physical behavior, geochemistry and materials applications. Mineralogical Society of America, Washington, D.C. | |||||||||
Internet Links for Opal-AN | ||||||||||
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| Specimens: | The following Opal-AN specimens are currently listed for sale on minfind.com. | |||||||||
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Localities for Opal-AN | ||||||||||
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The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the
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