Andersonite (Utah, USA) 2 : 無料・フリー素材/写真
Andersonite (Utah, USA) 2 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Andersonite glowing under ultraviolet light from 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 over 6000 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.Andersonite is a hydrous sodium calcium uranyl carbonate mineral, Na2Ca(UO2)(CO3)3·6H2O. It occurs in various shades of green or yellow, is moderately soft (H = 2.5 on the Mohs Hardness Scale), and is radioactive.Fluorescence occurs when short-wavelength ultraviolet radiation, long-wavelength ultraviolet radiation, or x-rays bombard atoms. This causes electron excitation, but 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.Locality: unrecorded / undisclosed site in Utah, USA---------------Photo gallery of andersonite:www.mindat.org/gallery.php?min= 219 |
| 撮影日 | 2024-04-07 08:47:23 |
| 撮影者 | James St. John |
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