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Post Info TOPIC: Madrid meteorite


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Title: Non-destructive analyses on a meteorite fragment that fell in the Madrid city centre in 1896.
Authors: Garcia-Guinea J1, Tormo L, Rubio Ordoñez A, Garcia-Moreno O.

The historical Madrid meteorite chondrite fell in 1896 showing thin melt veins with a 65% of brecciated forsterite fragments surrounded by a fine grained matrix formed by troilite, chromite and Fe-Ni blebs. It exhibits a delicate iron infill, neo-formation of troilite in pockets and shock veins and neo-formation of Na-feldspar formed at high temperature and fast quenching. The semi-quantitative mineral determinations were performed with IMAGEJ freeware and chemical mappings resulting in the following approximated compositions: olivine (~55%); augite (~10%); enstatite (~10%); plagioclase (~10%); chromite (~2%); troilite (~4%), kamacite-taenite --(Fe, Ni) (~7%) and merrillite (~7%). The specimen was also studied by computer tomography, micro-Raman spectroscopy and spectral cathodoluminescence. X-ray diffraction patterns were also recorded in non-destructive way on a polished surface because of the small size of the specimen. This combination of non-destructive techniques provides an improved knowledge on the Madrid-1896 meteorite compared to the previous study performed on the same specimen carried out twenty years ago by electron probe microanalysis and optical microscopy in destructive way. Limits of these techniques are the specimen's size in the analytical chambers and the threshold resolution of the microscopes analysing shock veins micro-crystals.

http://www.ncbi.nlm.nih.gov/pubmed/23953455



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The Madrid Meteorite of 1896

On Monday, February 10th, at 9h 29m 30s, there was observed an instantaneous bluish-white illumination in the atmosphere, so strong and vivid as to be visible in the inner rooms and in the open air.
The day was a magnificent one; blue sky, no wind and a radiant sun. Soon after there was plainly visible near the zenith and some few degrees to the SE, a white spot, like smoke, bearing NE to SW of about 6 degrees in length and 1 degree in width; its form was semicircular with the convexity turned to the east. In the centre and near the apex of the curve, it presented a condensation of a reddish colour, similar to that of clouds at sunset. The general appearance of the spot was that of a cirro-cumulus.

http://forum.netweather.tv/topic/48310-the-madrid-meteorite-of-1896/




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The Madrid meteorite fell in Madrid downtown the 10th of February of 1896, seconds before 9:30 am. Ten samples were recovered in the city, just after a bright white-blue light and a strong explosion scared and advertised the people of the meteorite fallen. The heaviest and lightest weight 143.79 and 1.3 respectively. The meteorites distribution formed an ellipse NW/SE orientated, where the largest meteorites fell in the NW. The compositions of olivines (Fa25) and low-Ca pyroxenes (Fs24) in Madrid meteorite are within the range of equilibrated L chondrite. The amount of troilite (5.02 wt. %) and metallic Fe-Ni (5.95 wt. %) support this classification. The material is highly crystallized and brecciated, with chondrules poorly defined and clearly visible (bigger than 50µm across) feldspars. This classify the meteorite in the petrographic type 6: the Madrid meteorite is therefore an impact melt breccia L6 ordinary chondrite.
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Explosion of an Aerolite in Madrid (February 10, 1896). 

"An aerolite exploded above this city to-day. There was a loud report, followed by a general panic. All buildings were shaken, and many windows were shattered. According to the officials of the Madrid Observatory, the explosion occurred twenty miles above the Earth. 
The sun was shining clearly at the time of the explosion, and the only thing visible in the sky was a white cloud, bordered with red, which was traveling rapidly across the heavens, leaving behind it a train of fine white dust. When the explosion occurred, the populace believed it was an earthquake, or a sign of divine wrath. 

Source

EXPLOSION OF AN AEROLITE.

This morning (says the Madrid correspondent of the London " Standard," under date 10th February), at 9h. 29m. 30s., with a clear, cloudless sky, and bright sunny weather, a singular phenomenon startled the inhabitamts of the Spanish capital. They first noticed a bright flash like lightning, followed, after about a minute and ten seconds, by several loud, rumbling reports, that made the windows and walls of houses shake, and caused marked symptoms of alarm among the domestic animals.
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The Madrid (L6) meteorite fell in Madrid, Spain, on the 10th February, 1896.
A total mass of 400 g was recovered.

40° 25'N, 3° 43'W



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