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Precious Opal
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Black Opal
Virgin Valley District, Humboldt Co., Nevada, USA
© 2001 John H. Betts
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| Colour: | Multi-coloured | |||||||||||
A variety of Opal
A valuable gem-variety of opal.
Most, but not all, is of the opal subtype Opal-AG.
Visit gemdat.org for gemological information about Precious Opal. Currently in public beta-test.
A valuable gem-variety of opal.
Most, but not all, is of the opal subtype Opal-AG.
Visit gemdat.org for gemological information about Precious Opal. Currently in public beta-test.
Classification of Precious Opal | ||||||||||
| mindat.org URL: | http://www.mindat.org/min-6666.html Please feel free to link to this page. | |||||||||
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Physical Properties of Precious Opal | ||||||||||
| Colour: | Multi-coloured | |||||||||
Chemical Properties of Precious Opal | ||||||||||
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| Essential elements: | H, O, Si | |||||||||
| All elements listed in formula: | H, O, Si | |||||||||
Other Names for Precious Opal | ||||||||||
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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 Precious Opal | ||||||||||
| Reference List: - + | Jones, J.B. and E.R. Segnit (1971), The nature of opal. I Nomenclature and constituent phases. Journal of the Geological Society of Australia: 18: 57-68. Anal. Chem. Acta (1994): 286: 107. Lapis Extra No. 10, Opal (1996). | |||||||||
Internet Links for Precious Opal | ||||||||||
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Localities for Precious Opal | ||||||||||
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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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(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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