CAMPIONE METEORITE - METEORITE SAMPLE

Name Allan Hills 99101
Abbreviation ALH 99101
Observed fall No
Place of Recovery Allan Hills, Antarctica
Country ANTARCTICA
Italian Antarctic Expedition 15
Latitude 76° 45' 40'' S
Longitude 159° 27' 9'' E
Findsite remarks Allan Hills Main Icefield
Field description egg-shaped; 4 x 3.5 x 3.5 cm in size; 60% of the external surface covered by a matt black fusion crust; large chondrules up to 3 mm in diameter and pale, mm-sized, angular inclusions are visible on broken surfaces
Find date (dd/mm/yyyy) 21/1/2000
Finder GUADAGNIN R.
Original Mass (g) 134.4
Mass at MNA (g) 117.37
Thin section available
Status OFFICIAL
Coarse Type STONY
Type CHONDRITE
Class/Clan ORDINARY CHONDRITE
Group LL 3
Shock stage S4
Weathering grade W1
Fa (Ol) 3-35
Fs (low Ca Px) 0-2
Classified by C. Ferraris and L. Folco (MNA-SI)
Comments Chondrule abundance ~80%; chondrule mean diameter ~0.8 mm; metal abundance ~4%; fayalite mol% in olivine ranges Fa3-35, ferrosilite mol% in enstatite ranges Fs0-2; weak mosaicism along with planar deformation features and planar fracturing indicates shock stage S4, according to Stöffler et al. (1991); metal grains are sometimes rimmed by secondary oxides indicating a terrestrial weathering level W1, according to Wlotzka (1993).
Other data
References
  1. Folco L. and Rastelli N. (2002) The meteorite collection of the Museo Nazionale dell'Antartide in Siena. December 2002 update. Terra Antartica 9(2), 101-117.
    http://192.167.120.37/Editoria/TAP/TA_pdfs/Volume_09/TA_09_101_Folco.pdf
  2. Gattacceca J., Rochette P., Denise M., Consolomagno G. and Folco L. (2005) An impact origin for the foliation of chondrites. Earth Planet. Sci. Lett. 234(3-4), 351-368.
    https://doi.org/10.1016/j.epsl.2005.03.002
  3. Grossman J.N. (2000) The Meteoritical Bulletin, No. 84, 2000 September. Meteorit. Planet. Sci. 35 (S5), A199-A225.
    https://doi.org/10.1111/j.1945-5100.2000.tb01797.x
  4. Musolino A. and Folco L. (2021) Atlas of meteorites in thin sections. Università degli Studi di Pisa, Pisa, 144 pp.
    https://repositories.dst.unipi.it/documenti/Atlas_of_Meteorites_2021.06.23.pdf
  5. Rochette P., Sagnotti L., Consolomagno G., Folco L., Maras A., Panzarino F., Pesonen L., Serra R. and Terho M. (2001) A magnetic susceptibility database for stony meteorites. Quaderni di Geofisica 18, 1-6.
    https://editoria.ingv.it/archivio_pdf/qdg/18/pdf/qdg_18.pdf
PROJECT
Title Concentrazioni di meteoriti: individuazione, raccolta e studio
Acr
Code
PI Marcello Mellini

Sample Picture