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Impactite is an informal term describing a rock created or modified by the impact of a meteorite.〔(Classification and nomenclature of impactites )〕 The term encompasses shock-metamorphosed target rocks, melts (suevites) and mixtures of the two, as well as sedimentary rocks with significant impact-derived components (shocked mineral grains, tektites, anomalous geochemical signatures, etc.). In June 2015, NASA reported that impact glass has been detected on the planet Mars - such material may contain preserved signs of ancient life—if life existed. When a meteor strikes a planet's surface, the energy release from the impact can melt rock and soil into a liquid. If the liquid cools and hardens quickly into a solid, impact glass forms before the atoms have time to arrange into a crystal lattice. Impact glass is dark brown, almost black, and partly transparent. ==Some localities== * Alamo bolide impact (Late Devonian) of Nevada * Alga crater on the planet Mars〔 * Charlevoix crater of Québec * Darwin glass from Tasmania * Manicouagan crater of Québec * Neugrund crater of Québec * Nördlinger Ries crater * Rochechouart crater * Wabar impact site 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「impactite」の詳細全文を読む スポンサード リンク
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