File:Opalite (Tertiary; Colado Mine, Velvet Mining District, Nevada, USA).jpg
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| Description |
English: Opalite from the Tertiary of Nevada, USA.
Opalite is an opal-dominated rock (opal = amorphous hydrous silica = SiO2·nH2O). “Opal” is a mineral/mineraloid name. “Opalite” is a rock name. Opalites form principally by alteration of volcanic rock or alteration of siliceous sinter (a type of hot spring deposit). They are often described as “impure” opal rocks - they lack the famous “fire” & rainbow colors of gem-grade opal. Opalite is fairly hard, has vitreous luster (usually), and breaks with conchoidal fracture, resulting in sharp broken edges. This opalite sample comes from a Miocene-aged, lacustrine diatomite deposit being mined in northwestern Nevada - the exact geologic context has not been recorded. Diatomite is a biogenic sedimentary rock similar in appearance to chalk - it is whitish, soft, and powdery. Unlike chalk, diatomite is composed of opaline diatom microfossils. Locality: Colado Mine, northwest of Trinity Peak, Velvet Mining District, Pershing County, northwestern Nevada, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/52087207161/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/52087207161. It was reviewed on 21 May 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:50, 21 May 2022 | | 3,030 × 2,449 (3.9 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52087207161/ with UploadWizard |
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