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Broumov meteorite (Braunau meteorite), Broumov (Braunau), Hradec Králové Region, Czech Republic

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Latitude & Longitude (WGS84): 50° 36' 0'' North , 16° 17' 60'' East
Latitude & Longitude (decimal): 50.60000,16.30000
GeoHash:G#: u2gxfgmq3
Other regions containing this locality:Bohemia (Böhmen; Boehmen), Czech Republic
Köppen climate type:Cfb : Temperate oceanic climate


Iron, IIAB (Hexahedrite)
Fall, 14 July 1847; 39 kg, two masses

In the predawn hours loud detonations roused people from their beds and homes near the Braunau Benedictine Abbey as two masses landed 2,200 m apart. The larger 23.6 kg mass created a 0.9 m deep hole in a meadow while the smaller 17.2 kg mass penetrated the roof of a small cabin where three children slept. The Braunau meteorite was only the third witnessed and recorded iron meteorite fall in the western world and the first witnessed fall of a IIAB hexahedrite. During the 19th Century its new and well-studied crystallographic and textural features led to a number of developments in the slowly emerging field of meteoritics. As Braunau consists essentially of a single isometric or cubical iron phase, kamacite — it became the first labelled 'hexahedrite.' Indeed, Braunau is not only 'monominerallic' — most of its mass is derived from a single crystal. Hexahedrites are found exclusively among Ni-poor irons. The Neumann lines (Neumann bands) indicative of preterrestrial or entry shocks were also first discovered in Braunau's kamacite.

However, Braunau is not completely composed of kamacite. Minor amounts of troilite and schreibersite are also found as in many iron meteorites. The term 'rhabdites' were first applied to the tiny needles of schreibersite found in Braunau. At the time it was not realized that the rhabdites were, in fact, composed of schreibersite, but the term has still been retained as a very useful textural descriptor. As in other meteorites, Braunau's troilite is accompanied by small amounts of daubréelite, an iron-chromium sulfide foreign to virtually all terrestrial environments.

The first investigators were also surprised to find magnetite and wüstite in the meteorite's fusion crust. While these minerals were well known, their appearance in this context was surprising as wüstite, in particular, is unstable in many terrestrial environments.

Braunau is one of only 6 witnessed IIAB iron falls. About 18 kg, including all of the smaller piece, are now preserved at the National Museum in Prague.


Mineral List


7 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Permian
252.17 - 298.9 Ma



ID: 3191119
Paleozoic sedimentary rocks

Age: Permian (252.17 - 298.9 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Permian
252.17 - 298.9 Ma



ID: 3147000
Permian sandstone

Age: Permian (252.17 - 298.9 Ma)

Lithology: Major:{sandstone}, Minor{conglomerate,siltstone,mudstone}

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Johann G. Neumann (1849): Ueber die krystallinische Struktur des Meteoreisens von Braunau. Naturwissenschaftliche Abhandlungen Wien 3, 45-56.
Mason, B. H. (1962). Meteorites. John Wiley and Sons, Inc.: New York & London. 227 pages.
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.
Grady, M. M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.

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