Soon after the impact, local residents recovered numerous pieces of the impactor from the ejecta blanket and the sides of the crater. The 27.20 g sample pictured above was collected only few days after the event by Jan Hattenbach, who also documented the crater in photo and provided a thorough account of the event that was later published in the German astronomical periodical “Sterne und Weltraum” (Stars & Space) (12/2007). The meteorite fragment is now part of the Buhl Meteorite Collection with the inventory number B-203. Pictured below is a 350 g fragment, one of the largest recovered. Most of the recovered samples were in size from dust grains to a few grams. The image of the 350 g specimen was kindly provided by Erwin R. of www.bolivia-minerals.com.
350 g fragment of the Carancas meteorite, one of the largest samples recovered. Meter in Inch. Photo courtesy of Erwin R. from Bolivia Minerals
Among other experts who arrived early at the scene was US professional meteorite hunter Mike Farmer. Farmer purchased samples of the impactor (some of which directly from local police representatives), of which he donated many to scientific institutions for analysis and classification purposes. On 5 October 2007, the Lunar and Planetary Laboratory of the University of Arizona published their results. According to their report, most specimens collected are without fusion crust and have a grey color with some metal and chondrules visible, although the chondrules are not easily observed.
At least one specimen had two different lithologies, grey and white in color, indicating it is a breccia. Numerous, black shock veins, often on more than one face of a specimen, were observed. At least one large (~2 cm) metal piece was also recovered, with a thin layer of stone attached to it. The thin section analyzed showed the rock to have experienced extensive recrystallization of the matrix with few relict chondrules present. Relict chondrules range in size from ~170 µm to 1 mm. Olivine and orthopyroxene were observed with abundant Fe, Ni-metal and Fe-rich sulfide. The Carancas Meteorite was classified as an H4-5 type ordinary chondrite.
A preliminary report on the Carancas event was also published on the web by Luisa Macedo F. and José Macharé O. of INGEMMET, Peru (www.ingemmet.gob.pe). Their report in Spanish can be downloaded here