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| Tektite | |
|---|---|
| Name | Tektite |
| Category | Natural glass |
| Formula | SiO2-rich glass with variable Al2O3, FeO, MgO |
| Color | Black, green, brown, gray, yellow |
| Habit | Irregular, aerodynamic, splash forms |
| Mohs | 5–6 |
| Luster | Vitreous, subvitreous |
| Streak | White |
| Gravity | 2.3–2.6 |
| Diaphaneity | Opaque to translucent |
Tektite Tektite are small, natural glass objects formed by high-energy impact events; they occur as aerodynamic, splash-molded forms and as irregular glassy masses and are found in distinct geographic strewn fields associated with known impact structures. First recognized in the 18th and 19th centuries by naturalists and mineralogists studying meteorite falls, tektite research has involved collaboration among Georges Cuvier, James Hutton, Charles Lyell, Alfred Wegener, Walter Alvarez, and teams from institutions such as the Smithsonian Institution, Max Planck Society, and United States Geological Survey.
The term derives from the Greek tektos ("molten") as adopted in classificatory work by 19th‑century mineralogists and collectors associated with museums like the British Museum and the Musée National d'Histoire Naturelle. Early specimens linked to meteorite hypotheses were exchanged among correspondents including Jean-Baptiste Biot, Alexander von Humboldt, Roderick Murchison, and contributors to the proceedings of the Royal Society. Systematic mapping and description accelerated with field studies by investigators connected to the Geological Society of London, the Geological Survey of India, the United States Geological Survey, and university departments at Harvard University, University of Cambridge, and University of Vienna.
Tektite assemblages are categorized into primary groups and forms: australite, indochinite, moldavite, philippinite, and bediasite, each named for regions recognized by geological surveys of Australia, Southeast Asia, Czech Republic, Philippines, and United States. Morphologies include splashforms, layered forms, and Muong Nong–type layered tektites; research literature from Carnegie Institution for Science, Max Planck Institute for Chemistry, and university departments documents distinctions by petrography, density, and inclusion chemistry. Museums such as the Natural History Museum, London, National Museum of Natural History (France), and the National Museum of Natural History (Smithsonian) maintain reference collections used for typological comparison.
Models for formation invoke hypervelocity impacts, shock melting, and ballistic transport proposed by teams including Eugene Shoemaker, Gene Shoemaker, H. J. Melosh, Don R. Davis, and Paul S. Weiss, and debated in forums at Lunar and Planetary Science Conference, American Geophysical Union meetings, and journals like Nature and Science. Proposed mechanisms link specific strewn fields to impact structures such as the Chesapeake Bay impact crater, the Popigai crater, and others identified via geophysical surveys by USGS and Geological Survey of Canada. Alternative hypotheses invoking volcanic glass or fulgurites were evaluated and largely discounted by isotopic analysis from laboratories at Geological Survey of Japan, Chinese Academy of Sciences, and National Taiwan University.
Analytical studies using electron microprobe, laser ablation inductively coupled plasma mass spectrometry (LA‑ICP‑MS), and transmission electron microscopy conducted at Lawrence Livermore National Laboratory, Max Planck Institute for Chemistry, and university facilities reveal high silica content with low water, elevated levels of nickel, chromium, and radiogenic isotope signatures comparable to local target rocks. Physical attributes—vitreous luster, conchoidal fracture, low porosity, and aerodynamic shapes—are documented in specimen catalogs at the American Museum of Natural History, Museo Nacional de Ciencias Naturales (Madrid), and the Shanghai Natural History Museum. Geochemical fingerprints tying tektites to terrestrial lithologies have been reported in analyses by researchers affiliated with Carnegie Institution for Science, Massachusetts Institute of Technology, Caltech, and the Geological Survey of India.
Major strewn fields include the Australasian, Central European (moldavite), Ivory Coast, and North American (including bediasite and georgiaites) fields; each is mapped in regional syntheses by the Australian National University, Czech Geological Survey, Institut Pasteur, and national geological agencies. Field surveys coordinated with satellite remote sensing from Landsat, geophysical reconnaissance by European Space Agency, and drilling programs tied to the International Continental Scientific Drilling Program have refined distribution patterns and linked deposits to proximal and distal ejecta models studied by teams at Stanford University, University of Tokyo, and ETH Zurich.
Tektite research informs planetary science, impact cratering mechanics, and stratigraphic correlation; findings interact with work on the Cretaceous–Paleogene extinction event, impact stratigraphy used by the International Commission on Stratigraphy, and experimental shock petrology at facilities like Sandia National Laboratories and Lawrence Berkeley National Laboratory. Isotopic dating techniques (argon‑argon, fission track) employed by laboratories at University of California, Berkeley, University of Oxford, and Max Planck Institute for Chemistry provide age constraints that tie tektites to events in the late Neogene and Cenozoic. Interdisciplinary projects connecting geochemistry, geophysics, and remote sensing have been presented at American Geophysical Union and European Geosciences Union assemblies.
Tektite have featured in artifacts and jewelry traditions documented by ethnographers at the British Museum, Metropolitan Museum of Art, and regional museums in Southeast Asia and Central Europe. Collecting communities, lapidary groups, and auction houses including Sotheby's and Christie's handle rare specimens like moldavite and australite, while academic repositories at Smithsonian Institution and national museums curate type specimens. Popular literature and pseudoscientific claims intersecting with work by authors and media outlets have prompted museums and university departments to publish outreach materials clarifying scientific consensus.
Category:Minerals