File:Barite fluorescing (Cedar Mountain Formation, Lower Cretaceous; Uintah County, Utah, USA) 3 (32393726105).jpg
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Summary
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| Description |
Barite from Utah, USA. (public display, Utah Field House of Natural History, Vernal, Utah, USA) A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are about 5400 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates. The sulfate minerals all contain one or more sulfate anions (SO4-2). Barite (a.k.a. baryte) is a barium sulfate mineral (BaSO4). It has a nonmetallic luster, a whitish to clearish color, is moderately soft (H=3 to 3.5), has three cleavage planes not at right angles, and is noticeably heavy for its size. The barite in this rock sample is glowing reddish under black light - ultraviolet light (UV). Why do some minerals fluoresce under UV light? When short-wavelength UV radiation, long-wavelength UV radiation, or x-rays bombard atoms, electron excitation occurs. The electrons do not remain in an energetically excited state. They quickly give off energy and resume their normal energy levels. If the electron energy release is in the visible spectrum of light, a mineral glows, or fluoresces. Stratigraphy: Cedar Mountain Formation, Lower Cretaceous Locality: Uintah County, northeastern Utah, USA Photo gallery of barite: <a href="http://www.mindat.org/gallery.php?min=549" rel="nofollow">www.mindat.org/gallery.php?min=549</a> |
| Date | |
| Source | Barite fluorescing (Cedar Mountain Formation, Lower Cretaceous; Uintah County, Utah, USA) 3 |
| Author | James St. John |
Licensing
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/32393726105. It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 08:59, 1 December 2019 | | 2,715 × 2,001 (3.6 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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