Fulgurite (Sahara Dune Field, Morocco) 12 : 無料・フリー素材/写真
Fulgurite (Sahara Dune Field, Morocco) 12 / 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 | Fulgurite from Morocco.Fulgurites are glassy to vesicular, tubular to branching masses caused by lightning striking the ground (often unconsolidated materials such as sand or soil). If the target materials are silica-rich (SiO2 - quartz), then the fulgurites will be composed of lechatelierite, a form of amorphous silica. The lechatelierite in older fulgurites will have converted to cristobalite or tridymite, which are crystalline polymorphs of quartz.-----------------------------------Info. from label:Fulgurites form when a lightning bolt strikes the Earth's surface, fusing the material into a glass tube, sometimes with a hollow center. When lightning strikes sandy soil, the air and moisture in the sand are rapidly heated. Quartz sand melts at a temperature of roughly 1600° Celsius to 2000° Celsius, depending on the moisture content. The name comes from the Latin "fulgur", for lightning.These are Type 1 fulgurites, which form in sand as tubular structures, sometimes with the central opening collapsed, and frequently coated with sand.-----------------------------------Locality: undisclosed site in the Sahara Dune Field, Morocco, northwestern Africa-----------------------------------Info. at:en.wikipedia.org/wiki/Fulgurite |
| 撮影日 | 2025-06-02 18:04:19 |
| 撮影者 | James St. John |
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