Hyalite opal fluorescing (Bohemia, Czech Republic) 5 : 無料・フリー素材/写真
Hyalite opal fluorescing (Bohemia, Czech Republic) 5 / 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 | Fluorescing hyalite opal from Bohemia. (public display, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA)Seen here is hyalite opal (SiO2·nH2O - hydrous silica) - it is clear material in ordinary light. Hyalite is also known as glass opal. It is composed of opal-AN, which refers to amorphous opal having a network structure similar to silica glass, rather than opal consisting of silica gel spheres/colloids (most opal is the latter type).Bohemian hyalite opal glows (fluoresces) green under ultraviolet black light (UV). Fluorescence occurs as a result of short-wavelength UV radiation, long-wavelength UV radiation, or x-rays bombarding 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. |
| 撮影日 | 2017-07-12 12:46:21 |
| 撮影者 | James St. John |
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