The Middlesborough meteorite fell on 14th March 1881 as a single 1.5 kg stone. It landed at Pennyman's siding on the railway about 1.75 miles from Middlesborough in NE England. The impact was witnessed by railwaymen who heard a "rushing" sound followed by a thud. Alexander Herschel later described the hole it made as a round vertical hole into which a man's arm might be thrust. The shape of the meteorite is the result of severe melting and abrasion during its entry into the Earth's atmosphere.
The Middlesborough meteorite is classified as an L6 chondrite, meaning it has a low iron content (5-10%) and indistinct chondrules that have been metamorphosed under conditions capable of homogenising all mineral compositions. Look at moderate magnification in PPL to see chondrules (rounded features) consisting of olivine and pyroxene crystals. Rotation 1 shows a barred olivine chondrule.
Specimen: BM54267 (stills are courtesy of GeoEd who make a replica of the meteorite)
Thin section: BM54267
This Collection consists of meteorites that have fallen in Great Britain and Ireland and which are now preserved in museum collections. We have also included samples of the two known meteorite impact deposits in the UK.
The Natural History Museum in London offers more information about meteorites and meteorite categories; there is more information about its meteorite collections here.