Berthoud meteorite, Weld Co., Colorado, USA
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Fell 5 Oct 2004, 960 g
In the early afternoon Megan and Andy Clifford walked out of the house, first heard a whistle, then a thump, and soon found a meteoritic stone still partially covered by its fusion crust. The Berthoud Eucrite's predominant constituents are pyroxene and plagioclase, partially brecciated and somewhat recrystallized. Orthopyroxenes have exsolution lamellae while plagioclase (bytownite) contains tiny inclusion blebs. Fractures and fine melt veins run through the meteorite. Accessory minerals include chromite, phosphates, iron sulfides, ilmenite, and silica.
Oxygen-isotope ratios are well-placed on the Eucrite-Fractionation Line (Δ17O= -0.227‰) while Fe/Mn =31 molar ratios in pyroxene are also fully consistent with membership in the main group of HED (Howardites-Eucrites-Diogenites. Most HED meteorites are believed to be fragments of the asteroid 4 Vesta.
Mineral List
6 entries listed. 2 valid minerals.
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References
Weisberg et al,. (2008). The Meteoritical Bulletin, No. 94, September 2008. Meteoritics & Planetary Science 43 (9):1551-1588. (Sept 2008)
Scott, E. R. D., Greenwood, R. C., Franchi, I. A. & Sanders, I. S. (2009) Oxygen isotopic constraints on the origin and parent bodies of eucrites, diogenites, and howardites: Geochimica et Cosmochimica Acta 73 (19): 5835-5853. (Oct 2009)
Scott, E. R. D., Greenwood, R. C., Franchi, I. A. & Sanders, I. S. (2009) Oxygen isotopic constraints on the origin and parent bodies of eucrites, diogenites, and howardites: Geochimica et Cosmochimica Acta 73 (19): 5835-5853. (Oct 2009)
External Links
http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5633620
http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5661211
http://www.cloudbait.com/science/bermet.html=Cloudbait Observatory report
http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5661211
http://www.cloudbait.com/science/bermet.html=Cloudbait Observatory report