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Country: Namibia
State/District: Grootfontein
Co-ordinates: 19°35'S, 17°55'E
Date of find: 1920
Total known weight: 60,000kg (approx.)
Number of pieces: 1
Classification:
Type: Ataxite, Ni-rich
Shock Stage:
Weathering Stage:
Mineral Analyses:
Pairings: not known
Synonyms: Grootfontein Hoba Wes Hoba West Hobart West
Metbase description: Show/Hide
A mass, measuring over 9 x 9 x 3.2 ft., of very ductile iron, was found on a farm 12 miles W of Grootfontein. Weight estimated from measurements at 60 metric tons, analysis, 16.24% Ni, L.J.Spencer, Min. Mag., 1932, 23, p.1, M.H.Hey, Cat. Met., 1966, p.201. Cosmogenic radionuclides, terrestrial and exposure ages, R.H.McCorkell et al., Meteoritics, 1968, 4, p.113. K-Ar ages, W.Kaiser and J.Zähringer, Meteorite Research, ed. P.M.Millman, D.Reidel, Dordrecht, Holland, 1969, p.429. Structure, H.J.Axon and P.L.Smith, Min. Mag., 1972, 38, p.736. Further analysis, 16.56% Ni, 0.192 ppm Ga, 0.049 ppm Ge, 27 ppm Ir, R.Schaudy et al., Icarus, 1972, 17, p.174. The main mass remains at the place of fall, A.L.Graham et al., Cat. Met., 1985, p.168. Description, V.F.Buchwald, Handbook of Iron Meteorites, Univ. of California, 1975, p.647. Ag isotopic composition, T.Kaiser and G.J.Wasserburg, Meteoritics, 1980, 15, p.310 (abs.). Study of fine structure, this ataxite mainly consists of type III plessite formed from decomposition of martensite, P.M.Novotny et al., GCA, 1982, 46, p.2461. Nitrogen isotopic composition, R.O.Pepin and R.H.Becker, Meteoritics, 1982, 17, p.269 (abs.). Ag and Pd abundances and isotopic compositions, T.Kaiser and G.J.Wasserburg, GCA, 1983, 47, p.43; see also, LPSC, 1981, 12, p.525 (abs.); J.H.Chen and G.J.Wasserburg, GCA, 1990, 54, p.1729. New INAA data and cooling rate calculation, K.L.Rasmussen et al., GCA, 1984, 48, p.805. Re-Os isotopic composition, T.Hirata and A.Masuda, Meteoritics, 1992, 27, p.569; see also, J.J.Shen et al., GCA, 1996, 60, p.2887. Mineralogy and composition of weathering products, D.C.Golden et al., LPSC, 1992, 23, p.421 (abs.). Chemistry and mineralogy of oxide surface layer, D.C.Golden et al., Meteoritics, 1995, 30, p.418. ICP-MS analysis of PGEs, A.J.Campbell and M.Humayun, LPSC, 1999, 30, abs. #1974. Historical notes, recovery circumstances, U.B.Marvin, Workshop on Extraterrestrial Materials from Cold and Hot Deserts, LPI Contrib. No. 997, Houston, 2000, p.48. Ru isotopic composition, J.H.Chen et al., LPSC, 2003, 34, abs. #1789; see also, D.A.Papanastassiou et al., LPSC, 2004, 35, abs. #1828. Mo isotopiccomposition, J.H.Chen et al., LPSC, 2004, 35, abs. #1431.
The meteorite was data copied from MetBase 7.1 for Windows.
For information about this software please contact the Author: Joern Koblitz, The MetBase Library of Meteoritics and Planetary Sciences, Benquestrasse 27, D-28209 Bremen, Germany
Phone: +49 421 24 100 24 Fax: +49 421 24 100 99
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